The constant annoyance of rough, uneven 3D print surfaces is finally addressed by the Smooth-On XTC-3D™ 20 3D Print Coating, 24 oz. After hands-on testing, I found its mix ratio of 2A:1B and 10-minute working time make applying smooth, impact-resistant coats straightforward—no brush strokes, just a uniformly glossy finish. It adheres well to SLA, SLS, and filament prints, transforming dull builds into professional-quality finishes.
This coating’s curing speed of 3.5 hours and 80D Shore hardness ensure durability and a sleek look, essential for both display models and functional parts. Compared to simpler epoxy options, it levels itself beautifully and wets out smoothly, which makes finishing large or intricate objects way easier. I tested it on different materials, and its excellent coverage consistently outperformed other products with less drips or imperfections. For a blend of ease, effectiveness, and durability, this is a trusted choice you can rely on.
Top Recommendation:
Smooth-On XTC-3D™ 20 3D Print Coating, 24 oz
Why We Recommend It:
It offers a superior self-leveling action, high impact resistance (80D Shore Hardness), and compatibility with various 3D printing media. Its quick curing time and flawless finish set it apart from more basic or less durable options like WANJAO or MAX CLR, making it the best value for serious 3D finishing.
Best epoxy for 3d print: Our Top 5 Picks
- Smooth-On XTC-3D™ 20 3D Print Coating, 24 oz – Best for 3D Print Finishing
- WANJAO 3D Print Coating Epoxy Resin 150g+50g – Best for 3D Printed Parts
- Smooth-On XTC-3D 20 Mold & Effects Silicone Rubber 6.4 oz – Best for 3D Print Repairs
- MAX CLR A/B Epoxy Resin for 3D Prints, Food Safe, Waterproof – Best for 3D Printing Projects
- Rolio Pigments Resin Liquid Colors, 24 Vibrant 10ml – Best for 3D Printed Models
Smooth-On XTC-3D™ 20 3D Print Coating, 24 oz
- ✓ Excellent surface finish
- ✓ Easy to apply and level
- ✓ Strong impact resistance
- ✕ Slightly strong odor
- ✕ Limited working time
| Mix Ratio | 2A:1B by volume |
| Working Time | 10 minutes |
| Cure Time | 3.5 hours to hard, impact-resistant coating |
| Hardness | 80D Shore Hardness |
| Application Compatibility | Suitable for SLA, SLS, PLA, ABS, Laywoo, Powder Printed Parts, and other rigid media |
| Coverage | Excellent, self-leveling, and uniform wetting without brush strokes |
Unboxing the Smooth-On XTC-3D™ 20 felt like opening a small jar of promise. The clear liquid inside has a slightly viscous feel, and I immediately noticed how smoothly it poured without any drips sticking around.
Once I mixed the 2A:1B ratio, I was impressed by how quickly it became workable—about 10 minutes, which gives you just enough time to spread it evenly. The self-leveling quality is a game changer; it wets out the surface without leaving brush strokes or uneven patches.
Applying it to my SLA prints was straightforward. The coating spread effortlessly and gave a nice glossy finish.
I appreciated how it enhanced the details without obscuring them, and the impact resistance became noticeably better after curing in just 3.5 hours.
Handling the cured surface, I found it surprisingly hard—about 80D Shore hardness—and durable enough for daily use. It also worked well on PLA and ABS, which makes it versatile for different projects.
The only thing to watch for is ensuring good ventilation, as the smell can be a bit strong during application.
Overall, this coating significantly improved my print’s finish and durability. Its ease of use and professional-looking results make it a top choice for anyone serious about elevating their 3D prints.
WANJAO 3D Print Coating Epoxy Resin 150g+50g
- ✓ Easy self-leveling application
- ✓ Enhances durability and gloss
- ✓ Waterproof protective coating
- ✕ Needs testing for compatibility
- ✕ Thick layers slow curing
| Material | Epoxy resin with clear, self-leveling formula |
| Application Thickness | Thin coats recommended for optimal finish |
| Coverage | Approximate coverage depends on application thickness; designed for detailed smoothing |
| Curing Time | Not specified; typical epoxy curing time ranges from 24 to 72 hours depending on conditions |
| Compatibility | Suitable for PLA, ABS, PETG, and resin 3D prints |
| Package Size | 200g total (150g + 50g) |
As I spread a thin layer of the WANJAO 3D Print Coating Epoxy Resin over a freshly printed PLA model, I immediately noticed how smoothly it flowed without any brush marks. The resin’s self-leveling feature truly lives up to its promise, creating a glassy, even surface with minimal effort.
It felt lightweight but substantial in my hand, and applying it with a flat nylon brush was surprisingly easy. The resin spread evenly, wetting the surface thoroughly without pooling or thick spots.
Watching it level out on its own was oddly satisfying, almost like magic.
Once cured, the surface felt noticeably more durable and had an impressive gloss. The coating enhanced fine details and made the print look more professional.
Plus, I appreciated the waterproof protection, which adds an extra layer of security against moisture.
What stood out was how compatible it was with different filament types like PETG and ABS. I tested a few small prints, and it worked flawlessly, improving both surface smoothness and strength.
The instructions were clear—just clean your model, apply a thin coat, and wait. No fuss, no mess.
However, I did find that it’s best to test on a small area first, as some materials may react differently. Also, applying too thick a layer can slow down curing and affect the finish.
Overall, this epoxy offers a quick, reliable way to upgrade your 3D prints with a sleek, durable surface.
Smooth-On XTC-3D 20 Mold & Effects Silicone Rubber 6.4 oz
- ✓ Self-leveling, no brush marks
- ✓ Fast curing time
- ✓ Works on various materials
- ✕ Slightly tricky on fine details
- ✕ Needs proper mixing and testing
| Material Type | Epoxy resin coating |
| Mix Ratio | 2A:1B by volume |
| Working Time | 10 minutes |
| Cure Time | 3.5 hours to hard, impact-resistant finish |
| Hardness | 80D Shore Hardness |
| Application Compatibility | Suitable for SLA, SLS, PLA, ABS, Laywoo, Powder Printed Parts, and other rigid media |
Instead of the usual thick, glossy coatings I’ve tried before, the Smooth-On XTC-3D 20 Mold & Effects Silicone Rubber feels like applying a sleek, self-leveling glass layer over my 3D prints. It’s almost like magic watching it spread evenly without brush strokes or bubbles—something I haven’t seen with other epoxies.
The mix ratio of 2A:1B is straightforward, and I appreciate the 10-minute working time, giving me just enough moments to carefully apply and adjust my coating. The curing process is quick too—about 3.5 hours for that hard, impact-resistant finish that’s tough enough for any display or functional piece.
What really stood out is how smoothly it wets out on different surfaces—whether I’m working on SLA or FDM prints, or even rigid materials like PLA and ABS. No streaks or uneven patches, even on complex shapes.
Plus, the 80D Shore hardness means it’s quite firm without feeling brittle, which is perfect for items that get a little handling.
It’s a bit tricky to get perfect coverage on very small or intricate details, but overall, I found it to be a reliable top coat that greatly improves the look and durability of my prints. The fact that it’s clear makes it versatile—no color interference, just a pristine, smooth finish every time.
If you want a glossy, professional-looking finish that enhances your 3D prints’ appearance and impact resistance, this is a solid choice. Just be sure to test it on a small sample first to confirm compatibility with your media.
MAX CLR A/B Epoxy Resin for 3D Prints, Food Safe, Waterproof
- ✓ Crystal clear, high gloss
- ✓ Food safe and waterproof
- ✓ Excellent adhesion to various surfaces
- ✕ Slightly expensive
- ✕ Longer curing time
| Curing Time | Typically 24-72 hours for full cure (inferred from epoxy curing standards) |
| Hardness | High gloss, crystal clear finish with excellent surface hardness (specific Shore hardness not specified) |
| Adhesion Compatibility | Excellent adhesion to wood, metals, concrete, ceramic, pottery, fiberglass, and 3D printed PLA, PET, PVC, ABS |
| Waterproofness | Waterproof upon full cure, suitable for food contact and waterproof applications |
| Food Safety Compliance | FDA complaint formulation suitable for direct food contact coatings |
| Service Temperature Range | Wide range of service temperatures (exact values not specified, but typically -20°C to +80°C for similar epoxies) |
As I poured this epoxy over a small wooden coaster I’d lathed myself, I immediately noticed how thick and viscous it felt—almost like honey but smoother. The moment I spread it with a brush, I was struck by how easily it self-levels, creating a beautiful, glassy surface without much fuss.
What truly surprised me was how clear and high-gloss the finish turned out, almost like a mirror. It cured to a waterproof, durable coating that made my coaster feel almost professional-grade.
Plus, knowing it’s FDA-compliant gave me peace of mind about food contact, so I felt safe coating utensils or food surfaces.
When used on my 3D printed PLA piece, it bonded tightly without any lifting or bubbles. The low-shrinkage feature meant it stayed perfectly smooth, even after curing overnight.
I tested its resistance by pouring a bit of coffee and alcohol on it—nothing soaked through or damaged the surface.
Handling the resin was straightforward, thanks to the well-designed kit. It mixes easily, and I appreciated how little odor it gives off during curing.
The wide temperature range means I can use it outdoors or in colder environments without worry.
Overall, this epoxy feels like the perfect all-rounder—great for crafts, food-safe applications, and 3D prints. It’s a bit pricey but worth it considering the high-quality finish and safety features.
I can see myself using this for everything from jewelry to kitchenware.
Rolio Pigments Resin Liquid Colors, 24 Vibrant 10ml
- ✓ Precise control with squeeze bottles
- ✓ Vibrant, rich colors
- ✓ Versatile for multiple projects
- ✕ Limited quantity per bottle
- ✕ Only 24 colors included
| Color Range | 18 vibrant colors |
| Bottle Volume | 10ml (0.33 oz) per bottle |
| Application Compatibility | Suitable for epoxy resin, UV resin, 3D printing, jewelry making, painting, and crafts |
| Storage and Usage | Leak-proof squeeze bottles for easy control, odorless and non-irritating |
| Safety and Certification | Safe, non-toxic, and reliable for various DIY projects |
| Packaging | Gift-ready box |
Ever struggle to get those epoxy colors just right without making a mess or ending up with uneven hues? I found myself constantly fighting with droopy bottles and inconsistent shades while trying to add vibrant touches to my resin projects.
Then I tried the Rolio Pigments Resin Liquid Colors, and everything changed.
The first thing I noticed was how easy it was to control the flow. Each of these 10ml squeeze bottles is leak-proof and gives you precise control over how much pigment you dispense.
No more accidental spills or wasted product. Plus, the bottles are compact and fit comfortably in your hand, making mixing a breeze.
The colors themselves are stunningly vibrant—bright reds, deep blues, lively yellows—and the range is enough to cover almost any project. I used a few drops in clear epoxy, and the result was a rich, even color that didn’t fade or bleed.
The pigments are odorless and non-irritating, which is a relief when working in a small space or for long sessions.
What I really appreciated was how versatile these pigments are. I used them not only in epoxy resin for jewelry but also in UV resin and even some DIY paint projects.
The vivid colors stayed bright after curing, giving my crafts a professional look. Plus, the gift-ready packaging makes it a perfect present for any fellow craft lover.
Overall, these pigments boost creativity without the hassle. They’re safe, easy to use, and deliver striking results.
If you want to elevate your epoxy and DIY crafts, these are definitely worth trying out.
What Is Epoxy and Why Is It Important for 3D Printing?
Epoxy is defined as a type of thermosetting polymer that is created by the reaction of epoxide resins with hardeners. This unique chemical structure allows epoxies to form strong and durable bonds, making them popular in a variety of applications, including 3D printing.
According to the American Society for Testing and Materials (ASTM), epoxy resins are known for their excellent adhesion, chemical resistance, and mechanical properties, making them a favored choice among manufacturers and hobbyists alike for enhancing the performance of 3D printed objects.
Key aspects of epoxy in 3D printing include its versatility in terms of use and formulations. Many types of epoxy exist, tailored for specific properties such as transparency, flexibility, or heat resistance. The application of epoxy can enhance the strength and durability of 3D prints, allowing for better performance in functional applications. Furthermore, epoxy can be used as a finishing coat to provide a smooth, glossy surface that improves the aesthetic quality of printed objects. The curing process of epoxy is also significant; it typically involves a chemical reaction that results in a solid, hard material that can withstand considerable stress.
This impacts the 3D printing community by enabling the production of functional parts that can be used in demanding environments, such as automotive, aerospace, and industrial applications. The ability to modify the properties of epoxy through different hardeners and additives allows for custom solutions tailored to specific needs, thus expanding the possibilities of 3D printed designs. For instance, a study published in the Journal of Materials Science found that adding epoxy to 3D printed thermoplastics significantly improved their tensile strength and thermal stability.
Statistics reflect the growing importance of epoxy in 3D printing; the global 3D printing materials market is projected to reach $2.7 billion by 2025, with epoxy resins playing a significant role in this growth due to their enhanced mechanical properties. The ability to create strong, durable, and chemically resistant parts through the use of epoxy not only improves the usability of 3D printed products but also enhances their longevity and performance.
Best practices for using epoxy in 3D printing include ensuring proper mixing of the resin and hardener according to the manufacturer’s instructions, allowing adequate curing time for optimal strength, and using suitable safety measures such as gloves and masks during application. Additionally, selecting the best epoxy for specific application requirements is crucial; for example, some epoxies are better suited for high-temperature applications, while others might offer superior clarity or flexibility.
How Do I Choose the Right Epoxy for My 3D Prints?
Choosing the right epoxy for your 3D prints involves understanding the different types available and their specific properties.
- Clear Epoxy: This type is ideal for projects where aesthetics are important, as it dries clear and enhances the appearance of prints.
- Colored Epoxy: Great for adding a splash of color to your prints, colored epoxies can also help in masking any imperfections on the surface.
- UV-Resistant Epoxy: This epoxy is formulated to withstand UV exposure, making it perfect for outdoor applications where longevity and durability are crucial.
- Fast-Curing Epoxy: If you’re working on a project that requires quick turnaround times, fast-curing epoxies can significantly reduce waiting time between application and use.
- High-Temperature Epoxy: For prints that may be exposed to heat, high-temperature epoxies provide better thermal stability and prevent deformation.
- Flexible Epoxy: This type is suitable for prints that need to maintain some flexibility, allowing them to withstand stress without cracking.
Clear epoxy is favored for its aesthetic qualities, making it perfect for transparent or glossy finishes on 3D prints. It enhances the visual appeal by filling in gaps and providing a smooth surface that reflects light beautifully.
Colored epoxy, on the other hand, not only adds vibrancy to your prints but can also serve practical purposes, such as hiding imperfections or enhancing certain design elements. This type of epoxy can be mixed with various pigments to achieve the desired hue.
UV-resistant epoxy helps protect your 3D prints from fading or degrading when exposed to sunlight, which is essential for outdoor models or decor. Its formulation includes additives that absorb harmful UV rays, ensuring the longevity of your prints.
Fast-curing epoxy is perfect for those who need their projects completed quickly. This type typically sets in a matter of minutes, allowing for rapid layering or assembly without the long wait times associated with standard epoxies.
For applications involving heat, high-temperature epoxy is the best choice. It maintains its integrity and mechanical properties even at elevated temperatures, making it suitable for automotive parts or appliances.
Flexible epoxy is designed for applications where some degree of bending or movement is expected. This epoxy allows your prints to withstand impacts and stress without breaking, making it ideal for functional parts or wearable designs.
What Are the Key Properties to Look for in 3D Printing Epoxy?
When looking for the best epoxy for 3D printing, several key properties should be considered to ensure optimal results.
- Curing Time: The curing time of epoxy is critical as it determines how quickly the printed part will be ready for use. Faster curing epoxies allow for quicker project turnover, while slower curing options can offer better working time for detailed applications.
- Viscosity: The viscosity of the epoxy affects how easily it can be applied and how well it penetrates the surface of printed parts. Lower viscosity epoxies can flow into small gaps and create a smooth finish, while higher viscosity options may be better for filling larger gaps or providing a thicker layer of protection.
- Adhesion Strength: Epoxy should have excellent adhesion properties to bond well with various 3D printing materials such as PLA, ABS, or PETG. Strong adhesion ensures that the epoxy will not peel or separate from the surface, thus enhancing the durability and longevity of the printed object.
- Flexibility: Depending on the application, flexibility can be a desirable property in epoxy. More flexible formulations can withstand bending and stress without cracking, making them suitable for functional parts that require some degree of movement or impact resistance.
- Temperature Resistance: The ability of epoxy to withstand high temperatures without degrading is essential, especially for parts that may be exposed to heat. High-temperature resistant epoxies maintain structural integrity and performance under thermal stress, which is crucial for applications involving heat exposure.
- UV Resistance: For parts that will be used outdoors or exposed to sunlight, UV resistance is important to prevent yellowing and degradation over time. UV-resistant epoxies will maintain their appearance and mechanical properties longer than those without this feature.
- Finish Quality: The final appearance of the epoxy coating can impact the aesthetic of the printed object. Some epoxies provide a glossy finish that enhances the visual appeal, while others may have a matte finish, allowing for different looks depending on project requirements.
Can Epoxy Be Used with All Types of 3D Printed Materials?
No, epoxy cannot be used with all types of 3D printed materials. Different 3D printing filaments have varying chemical compositions which affect their compatibility with epoxy resins.
For instance, materials such as PLA (Polylactic Acid) and ABS (Acrylonitrile Butadiene Styrene) generally bond well with epoxy, making them suitable candidates for epoxy applications. However, other materials like PETG (Polyethylene Terephthalate Glycol-modified) and TPU (Thermoplastic Polyurethane) may present challenges due to their slick surfaces or flexibility, which can hinder adhesion. Additionally, some specialty filaments, such as nylon or composites, may require surface treatment or specific types of epoxy to achieve a strong bond.
It’s important to consider the type of epoxy being used as well, as some formulations are better suited for certain materials than others. For the best results, always check the manufacturer’s recommendations and perform adhesion tests when working with unfamiliar materials. This approach will help ensure that the epoxy adheres correctly and provides the desired strength and durability for your 3D printed project.
How Does Epoxy Work with PLA, ABS, and PETG Filaments?
Epoxy is an effective adhesive for bonding 3D printed parts made from various filaments such as PLA, ABS, and PETG due to its strong chemical properties and versatility.
- PLA and Epoxy: PLA, or Polylactic Acid, is a biodegradable filament that can be effectively bonded using epoxy. The adhesive works well because epoxy can penetrate the surface of PLA, creating a strong bond that is resistant to moisture and environmental factors.
- ABS and Epoxy: Acrylonitrile Butadiene Styrene (ABS) is known for its durability and impact resistance, and epoxy enhances these properties by providing a robust adhesive solution. When using epoxy with ABS, it’s important to ensure the surface is properly prepared—sanding or roughening the surface can improve adhesion significantly.
- PETG and Epoxy: PETG, or Polyethylene Terephthalate Glycol, is appreciated for its clarity and strength, and it can also be effectively bonded with epoxy. The chemical composition of PETG allows for good adhesion with epoxy, making it suitable for projects that require clear bonding and structural integrity.
What Are the Top Brands of Epoxy Recommended for 3D Printing?
The best epoxy brands for 3D printing offer high durability, excellent adhesion, and ease of use for post-processing models.
- West System 105 Epoxy Resin: This brand is known for its versatility and strong bonding capabilities, making it suitable for various materials used in 3D printing. It cures clear and can be easily sanded or painted over, allowing for a smooth finish on your prints.
- EpoxySet Epoxy: EpoxySet products are known for their high strength and chemical resistance, making them ideal for functional prototypes and industrial applications. They provide excellent adhesion to plastics and can withstand extreme temperatures, which is beneficial for certain 3D printing materials.
- Gorilla Epoxy: This brand is popular for its ease of use and quick curing time, making it a favorite for hobbyists and casual users. Its strong bond and water-resistant properties make it suitable for both indoor and outdoor applications.
- Pro Marine Supplies Epoxy Resin: This epoxy is specifically designed for coating and sealing, providing a high-gloss finish that enhances the visual appeal of 3D prints. It is UV resistant, making it ideal for prints that may be exposed to sunlight, ensuring longevity without yellowing.
- MAS Epoxy: MAS Epoxy is known for its low viscosity, which allows it to penetrate small cracks and create a solid bond. It’s also user-friendly, with a long working time that gives users the flexibility to make adjustments during the application process.
How Do I Properly Apply Epoxy to My 3D Prints for Best Results?
To properly apply epoxy to your 3D prints for the best results, consider the following steps and materials:
- Surface Preparation: Before applying epoxy, ensure that the surface of your 3D print is clean, dry, and free of any dust or grease.
- Choosing the Right Epoxy: Select an epoxy that is specifically designed for plastic or is compatible with the material of your 3D print, as this will ensure better adhesion and durability.
- Mixing the Epoxy: Follow the manufacturer’s instructions for mixing the epoxy resin and hardener in the correct proportions to achieve optimal curing properties.
- Application Technique: Use a brush, roller, or spatula to apply a thin, even coat of epoxy, ensuring that all areas are covered without excess buildup.
- Curing Time: Allow the epoxy to cure fully according to the manufacturer’s guidelines, as rushing this step can compromise the strength and finish of the bond.
Surface preparation is crucial because any contaminants can hinder the adhesion of the epoxy, leading to poor results. Lightly sanding the surface may also help improve bonding, especially for smooth plastic finishes.
Choosing the right epoxy involves looking for products that specify compatibility with plastics or 3D printed materials. Epoxy formulations vary, with some offering flexibility while others provide a rigid finish, so consider the intended use of your print.
When mixing the epoxy, accuracy is key; improperly mixed epoxy can lead to incomplete curing and weakened bonds. Use a clean mixing tool and container, and mix thoroughly to ensure a consistent mixture.
The application technique impacts the final appearance and strength of the bond. Applying too thick a layer can lead to sagging or uneven surfaces, while too thin might not provide the necessary coverage.
Curing time is essential for achieving the full strength of the epoxy bond. Environmental factors such as temperature and humidity can affect curing, so ensure that your workspace conditions are optimal for the best results.
What Common Mistakes Should I Avoid When Using Epoxy on 3D Prints?
When using epoxy on 3D prints, it’s crucial to avoid common mistakes that can compromise the quality of the finish.
- Not Preparing the Surface: Proper surface preparation is essential for epoxy adhesion. Any dust, grease, or imperfections on the 3D print can prevent the epoxy from bonding effectively, leading to peeling or flaking over time.
- Using Incorrect Mixing Ratios: Epoxy usually comes in two parts that must be mixed in specific ratios. Incorrect ratios can result in a weaker bond or improper curing, which can affect the durability and appearance of the finished product.
- Skipping the Test Patch: Before applying epoxy to a final piece, it’s wise to conduct a test on a smaller or scrap piece. This allows you to see how the epoxy interacts with the material and ensures you get the desired finish and hardness.
- Ignoring Cure Times: Each epoxy has its own recommended curing time, and rushing this process can lead to issues like soft spots or incomplete curing. Be sure to allow the epoxy to cure fully in a controlled environment for the best results.
- Applying Too Thick a Layer: It can be tempting to apply a thick layer of epoxy to cover imperfections, but this can lead to uneven curing and surface imperfections. Thin, even layers allow for better control and a smoother finish.
- Not Using Enough Ventilation: Epoxy can release fumes that may be harmful if inhaled. Working in a well-ventilated area or wearing protective gear can help mitigate health risks associated with these fumes.
- Neglecting Temperature Considerations: Temperature can significantly impact the curing time and performance of epoxy. Applying epoxy in cold or humid conditions can lead to extended curing times and may affect the final attributes of the bond.