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Smooth-On XTC-3D™ 20 Mold Making & Special Effects Silicone Rubber, 3D Print Coating - 24 oz
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Purchase options and add-ons
Product Benefits | Color Protection |
Scent | Unscented |
Liquid Volume | 1 Fluid Ounces |
Item Form | Foam |
Brand | Smooth-On |
About this item
- High-Performance 3D Print Coating - Clear top coat for smoothing & finishing 3D printed parts.
- Ideal for application to both SLA & SLS prints, as well as PLA, ABS, Laywoo, Powder Printed Parts, and other rigid media.
- Mix Ratio of 2A:1B by Volume -Working time of 10 minutes - Cures to hard, impact-resistant coating in 3.5 hours - 80D Shore Hardness.
- Epoxy top coating self-levels and wets out uniformly without leaving brush strokes; offers excellent coverage.
- Perform a small-scale test of your project materials to determine suitability and compatibility. Refer to the technical bulletin for more information - available on our website
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This product has sustainability features recognized by trusted certifications.Safer chemicalsMade with chemicals safer for human health and the environment.As certified byGlobal Recycled Standard
Products certified to the Global Recycled Standard (GRS) contain recycled content that has been independently verified at each stage of the supply chain, from the source to the final product. In addition, social, environmental, and chemical criteria related to processing are required. The purchase of Global Recycled Standard (GRS) certified products demonstrates demand for recycled content and best processing practices in the supply chain.Certification BodySGSCertification NumberTE-00121753Recycled materialsContains at least 50% recycled material.As certified byGlobal Recycled Standard
Products certified to the Global Recycled Standard (GRS) contain recycled content that has been independently verified at each stage of the supply chain, from the source to the final product. In addition, social, environmental, and chemical criteria related to processing are required. The purchase of Global Recycled Standard (GRS) certified products demonstrates demand for recycled content and best processing practices in the supply chain.Certification BodySGSCertification NumberTE-00121753Worker well-beingManufactured on farms or in facilities that protect the rights and/or health of workers.As certified byGlobal Recycled Standard
Products certified to the Global Recycled Standard (GRS) contain recycled content that has been independently verified at each stage of the supply chain, from the source to the final product. In addition, social, environmental, and chemical criteria related to processing are required. The purchase of Global Recycled Standard (GRS) certified products demonstrates demand for recycled content and best processing practices in the supply chain.Certification BodySGSCertification NumberTE-00121753 - Sustainability features for this product
Sustainability features
This product has sustainability features recognized by trusted certifications.Carbon impactCarbon emissions from the lifecycle of this product were measured, reduced and offset.As certified byClimatePartner certified
The Climate neutral label by ClimatePartner certifies that the carbon footprint of a product was calculated and all associated emissions were offset. Additionally, ClimatePartner encourages companies to set ambitious reduction targets and reduce their products' carbon footprints. The certificate number can be entered on ClimatePartner’s website for additional information such as the supported carbon offset project(s). ClimatePartner is improving lives by helping companies tackle climate change with practical solutions.Certification NumberFSGJXJ - Sustainability features for this product
Sustainability features
This product has sustainability features recognized by trusted certifications.Forestry practicesMade with materials from well-managed forests, recycled materials, and/or other controlled wood sources.As certified byThe Forest Stewardship Council
The Forest Stewardship Council (FSC) supports responsible forestry, which is a vital solution to combat climate change. Choosing FSC-certified products – whether furniture, building materials, paper, rubber, or textiles – helps protect forests, wildlife, clean water and supports the Indigenous Peoples, forest workers and communities who depend on them. Choosing FSC-certified products can also help to mitigate climate change by supporting responsible management of the world’s forests. For a better future, choose FSC. - Sustainability features for this product
Sustainability features
This product has sustainability features recognized by trusted certifications.Safer chemicalsMade with chemicals safer for human health and the environment.As certified byGlobal Recycled Standard
Products certified to the Global Recycled Standard (GRS) contain recycled content that has been independently verified at each stage of the supply chain, from the source to the final product. In addition, social, environmental, and chemical criteria related to processing are required. The purchase of Global Recycled Standard (GRS) certified products demonstrates demand for recycled content and best processing practices in the supply chain.Certification BodyIntertekCertification NumberTE-00066022Recycled materialsContains at least 50% recycled material.As certified byGlobal Recycled Standard
Products certified to the Global Recycled Standard (GRS) contain recycled content that has been independently verified at each stage of the supply chain, from the source to the final product. In addition, social, environmental, and chemical criteria related to processing are required. The purchase of Global Recycled Standard (GRS) certified products demonstrates demand for recycled content and best processing practices in the supply chain.Certification BodyIntertekCertification NumberTE-00066022Worker well-beingManufactured on farms or in facilities that protect the rights and/or health of workers.As certified byGlobal Recycled Standard
Products certified to the Global Recycled Standard (GRS) contain recycled content that has been independently verified at each stage of the supply chain, from the source to the final product. In addition, social, environmental, and chemical criteria related to processing are required. The purchase of Global Recycled Standard (GRS) certified products demonstrates demand for recycled content and best processing practices in the supply chain.Certification BodyIntertekCertification NumberTE-00066022 - Sustainability features for this product
Sustainability features
This product has sustainability features recognized by trusted certifications.Packaging efficiencyReduced air and/or water in the product or packaging for more efficient transportation.As certified byCompact by Design (Amazon-developed Certification)
Compact by Design identifies products that, while they may not always look very different, have a more efficient design. By reducing water and/or air in the product or packaging, these become more efficient to ship. At scale, these small differences in product size and weight lead to significant carbon emission reductions. - Sustainability features for this product
Sustainability features
This product has sustainability features recognized by trusted certifications.Forestry practicesMade with materials from well-managed forests, recycled materials, and/or other controlled wood sources.As certified byThe Forest Stewardship Council
The Forest Stewardship Council (FSC) supports responsible forestry, which is a vital solution to combat climate change. Choosing FSC-certified products – whether furniture, building materials, paper, rubber, or textiles – helps protect forests, wildlife, clean water and supports the Indigenous Peoples, forest workers and communities who depend on them. Choosing FSC-certified products can also help to mitigate climate change by supporting responsible management of the world’s forests. For a better future, choose FSC.
Product details
- Is Discontinued By Manufacturer : No
- Product Dimensions : 7.87 x 3.94 x 2.76 inches; 1.41 Pounds
- Item model number : xtc3d
- Date First Available : November 10, 2014
- Manufacturer : Smooth-On, Inc.
- ASIN : B00PFXK4JY
- Best Sellers Rank: #11,831 in Industrial & Scientific (See Top 100 in Industrial & Scientific)
- #20 in Industrial Coatings
- Customer Reviews:
Important information
Directions
Mix two liquids, brush the mixture onto the 3D print, and allow it to cure.
Product Description







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Customer reviews
Customer Reviews, including Product Star Ratings help customers to learn more about the product and decide whether it is the right product for them.
To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyzed reviews to verify trustworthiness.
Learn more how customers reviews work on AmazonCustomers say
Customers are satisfied with the product's performance, ease of application, and quality. They find it works well, is simple to use, and comes with clear instructions. Many appreciate its smoothness, durability, and finish quality. However, some have mixed opinions on the finish and sanding time.
AI-generated from the text of customer reviews
Customers find that the epoxy works well when applied correctly. They are satisfied with the results and say it applies smoothly and dries shiny. Foam brushes and acid brushes work well for application.
"...The foam brushes work really well for application. Smooth-On offers online tutorial videos on You-Tube for this specific product. That helped a ton!..." Read more
"...the directions, do the prep work and you will end up with repeatable flawless results." Read more
"...The end result is going to be good, but the "eliminates 90% of finishing work" moniker really gives you the wrong impression...." Read more
"...With that said, This epoxy works extremely well, if you follow the directions carefully and use the correct brush for it...." Read more
Customers find the product easy to apply. It comes with clear instructions and material safety information. The resin applies smoothly with the included foam brush and cures to a hard, glossy finish.
"...This is super easy to use! If you have used any sort of resin you will already have an idea. You have your resin and hardener...." Read more
"...It mixes very easily, lasts quite a while on the plate, goes on well, sands easily, and has almost no smell...." Read more
"...The resin itself applies smoothly with the included foam brush, and it cures to a hard, glossy finish that brings out the detail in each print...." Read more
"...It's very easy to use while keeping some safety steps in mind. I wear gloves and eye protection. It will thicken within the ten minute working time...." Read more
Customers like the product. They find it a good alternative to dip sealants, with clear instructions and a nice pamphlet. It's great as a primer for Worbla, which has a bumpy texture.
"...It is great as a primer for Worbla as Worbla tends to have a very bumpy texture and with this you only need 1 or 2 coats to get a super smooth..." Read more
"...looking to take their 3D printed projects to the next level with a high-quality, reliable coating solution!" Read more
"I'm a big fan of Smooth-on products. Their OOMOO is great and I've dropped serious dough on their products over the years...." Read more
"...Overall, it's a good product, but not really needed with the newer generation 3D printers that actually print significantly smooth objects." Read more
Customers appreciate the smoothness of the product. It creates a sturdy and smooth surface for painting. The clear coating is not a chemical smoother, so it's great as a base. Some say it makes print shine and smooths layer lines and gaps wonderfully.
"...It is great as a primer for Worbla as Worbla tends to have a very bumpy texture and with this you only need 1 or 2 coats to get a super smooth..." Read more
"...This product is perfect for smoothing and finishing 3D prints, taking them from rough to a professional-grade finish with minimal effort...." Read more
"...Completely smoothed out and feels like glass with zero sanding. Awesome and a massive time saver for large prints...." Read more
"...Anyways i bought a second one and it's Fantastic for smoothing out Prints" Read more
Customers appreciate the product's durability. They say it adds strength and looks more sturdy. The bottles last a long time, and customers are confident in the quality of the brand. The epoxy is resilient against harsh acids and doesn't flake off.
"...I didn't expect it to NOT do this to be honest. It is resin. It did not flake off. It adheres to the foam...." Read more
"...Once cured, it provides a durable, protective coating that not only enhances the appearance but also adds strength to the print...." Read more
"...surface areas, this thing looked beautiful and it made my prints super strong...." Read more
"These bottles will last you a long time. Definitely worth the money. I usually only do one coat and call it good enough." Read more
Customers appreciate the finish quality of the product. They say it's great for finishing 3D prints, especially PLA stuff. It provides a glossy coating over 3D prints, smoothing statuettes and figurine type prints. It's helpful with prints like full-size helmets, as sanding those down can be tedious.
"...This product is perfect for smoothing and finishing 3D prints, taking them from rough to a professional-grade finish with minimal effort...." Read more
"This is basically a two part epoxy, formulated to brush onto 3D prints. Here are some observations I've had: *..." Read more
"Keep in mind this is a clear coating and NOT a chemical smoother, so its great as a base for paints or if you're fine with some layer lines showing..." Read more
"...It's most helpful with prints like full-size helmets. Sanding those down can be so tedious. However, you still need to sand after using this stuff...." Read more
Customers have different views on the finish. Some find it shiny and smooth, making prints sturdy. Others mention it stays tacky or dulls the finish, requiring sanding to get a good look.
"...my worbla and some foam pieces in this and it gave it a beautiful shiny smooth coat!..." Read more
"...smoothly with the included foam brush, and it cures to a hard, glossy finish that brings out the detail in each print...." Read more
"...If you don't do this, it dries smooth but lumpy and takes a ton of sanding to look good...." Read more
"...It fills layer lines very well for a smooth look once painted. It also provides a tough order coating." Read more
Customers have different experiences with the sanding time of the hair styling agent. Some say it requires less sanding than without using anything, and eliminates most post-sanding involved. Others mention it still needs sanding, and that it takes about a day to completely harden.
"...It cuts priming time in half if you are used to using classic methods like coating it in 6-8 layers of wood glue!..." Read more
"...It took about a day to completely harden." Read more
"...The end result is going to be good, but the "eliminates 90% of finishing work" moniker really gives you the wrong impression...." Read more
"...Super high gloss. Easy to tint with acrylic paint or food coloring...." Read more
Reviews with images

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Top reviews from the United States
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- Reviewed in the United States on February 6, 2017Size: 24 Fl Oz (Pack of 1)Verified PurchaseMY LORD. This stuff is super cool!I did not use this to coat 3D printed parts. I personally use it for cosplay purposes. I coated my worbla and some foam pieces in this and it gave it a beautiful shiny smooth coat! It is great as a primer for Worbla as Worbla tends to have a very bumpy texture and with this you only need 1 or 2 coats to get a super smooth surface! It cuts priming time in half if you are used to using classic methods like coating it in 6-8 layers of wood glue! This took around 3-4 hours to cure up. I let it sit overnight.
It is important to note that this has no flexibility once fully cured. I tested this on a piece of EVA foam and it just about shattered like glass when I warped the foam. I didn't expect it to NOT do this to be honest. It is resin. It did not flake off. It adheres to the foam. it just left a bunch of cracks all over the place! On pieces that will not bend at all, like weapons or shoulder pieces etc, I think this works well to give your foam pieces a smooth glossy finish. I had already primed my foam with several layers of plastidip before I decided to experiment. Plastidip + XTC-3D does work :).
This is super easy to use! If you have used any sort of resin you will already have an idea. You have your resin and hardener. The instructions will explain how to mix but this comes with a handy little mixing cup with measurement markings on the side. It also comes with a foam brush and Popsicle stick for stirring. You will need to have more of these items handy for more than one use! The foam brushes work really well for application. Smooth-On offers online tutorial videos on You-Tube for this specific product. That helped a ton! Have tin-foil on hand to make a tiny pool to sit the product in. This increases the time to apply because letting in sit in the cup will cure up to fast and it'll be hard to apply. You wouldn't get a smooth application in this case!
I'd imagine this would also work well as a nice shiny finish over paint! But I find It is SUPER shiny once cured. Almost TOO shiny. If this is not the look you want, you can just simply buff it down by sanding lightly over it. I still prefer a Shellac coating as my final step.
With the Prime shipping this was the best deal I could find on this product! I highly recommend this!
- Reviewed in the United States on February 7, 2024Size: 6.4 Oz. UnitVerified PurchaseXTC-3D is hands-down a must have for anyone with a 3d printer. I usually print in ABS and follow the old "tried and true" method of sanding followed by vapor smoothing followed by final sanding before painting. XTC-3D eliminates the need for all that extra effort.
To ensure a problem-free flawless finish:
- Make sure that your part is clean. Use isopropyl alcohol, acetone, or whatever appropriate cleaner for your material to wipe your print clean
- Mix the resin with the hardener in the exact ratio specified. Adding more hardener than necessary will only increase difficulty in applying it. Make sure that you mix it THOROUGHLY! I cannot stress this enough; You must mix it and continue mixing it until it becomes crystal clear. The longer you mix it, the better your finish will be, but the shorter your working time will be. I recommend mixing small batches at a time - you can always mix more if you run out.
- Make sure that the ambient temperature is within the recommended range. Trying to coat your print when the temperature is below 70F will obviously increase the time it takes to fully cure.
The mixing cup that is included is flimsy and not very strong. I made the mistake of mixing a batch and leaving it in the cup while applying it and the heat nearly turned the mixing cup into jellly and rendered it worthless. After mixing, pour it into another container, onto some aluminum foil, etc then wipe the mixing cup out with a shop towel, paper towel, etc.
The foam brush is not worth the hassle - this holds true for ANY foam brush. I recommend you get a decent paintbrush instead. The foam brush soaks up too much and deteriorates too quickly, but a paint brush can be cleaned out with acetone and reused several times.
I was so impressed with this stuff that I ordered 24oz of it. Follow the directions, do the prep work and you will end up with repeatable flawless results.
- Reviewed in the United States on July 27, 2018Size: 24 Fl Oz (Pack of 1)Verified PurchaseOverall this stuff is great. I've been using it to make 3d printed Mandalorian helmets. It mixes very easily, lasts quite a while on the plate, goes on well, sands easily, and has almost no smell.
It's not perfect though, but the marketing for it really, really overstates how easy and good it is. The #1 thing is that when you're applying it, you *must* follow the instructions and keep brushing over it until it finally starts to harden up. This takes ~20-30 minutes or so, during which you're just sitting there brushing and brushing and brushing. If you don't do this, it dries smooth but lumpy and takes a ton of sanding to look good.
If you just apply it, and maybe brush over it a few times, it looks like it's going on all nice and smooth, but when you come back an hour or two later (one positive is that it hardens up very nicely and quickly) the surface is going to be a bit like a golf ball. It's not runs or streaks (unless you slap tons of it on, getting drips is very unlikely), it just settles in a weird way, even if it's a second coat over an already smooth area.
On the plus side, it does sand very nicely with 220 grit sandpaper. 100 grit is a bit too much unless you do end up with a drip. The end result is going to be good, but the "eliminates 90% of finishing work" moniker really gives you the wrong impression. I've finished 3d printed items with a coat or two of filler primer and gotten excellent results in about five minutes of work, as compared to the hours I've already put into using this stuff.
Oh, and before you use it, buy a LOT of foam rubber brushes. Expect to use three or four of them over the course of a half ounce of material, especially with all the constant overbrushing you're going to have to do. After a few minutes the brush will start getting flimsy and if you keep using it, you'll end up with foam rubber bits on your surface. Michaels sells kits of a dozen or more of them for like $5.
It works, but it takes a lot of time.
Top reviews from other countries
- Marcel N.Reviewed in the United Arab Emirates on October 8, 2024
5.0 out of 5 stars Easy to work with
Size: 24 Fl Oz (Pack of 1)Verified PurchaseDries nicely
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SplinterReviewed in Spain on July 20, 2022
5.0 out of 5 stars Caro pero efectivo
Size: 24 Fl Oz (Pack of 1)Verified PurchaseAunque es un producto caro, cunde mucho.
Hay que mezclar cantidades muy pequeñas y extenderlas dejando la capa mas fina posible (evitaras gotas).
Se empieza a endurecer muy rápido, con lo que hay que andarse vivo para aplicarlo.
Me está gustando mucho.
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LydiaReviewed in France on February 3, 2021
5.0 out of 5 stars Trés bon produit
Size: 24 Fl Oz (Pack of 1)Verified PurchaseJ'ai acheté ce produit sur les recommandation d'un youtubeur. Je ne suis pas déçue. Les impression 3d rendent vraiment bien après avoir appliqué ce produit. Bien lire le mode d'emploi. Seul regret le mode d'emploi n'est pas en français.
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C ThomasReviewed in Canada on February 16, 2019
5.0 out of 5 stars Bon produit
Size: 24 Fl Oz (Pack of 1)Verified PurchaseNe pas en préparer trop car possède une bonne couvrance.
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St.GReviewed in Germany on March 19, 2020
5.0 out of 5 stars Bin zufrieden
Size: 24 Fl Oz (Pack of 1)Verified PurchaseGefällt mir gut bei mein 3d druck