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Smooth-On XTC-3D™ 20 Mold Making & Special Effects Silicone Rubber, 3D Print Coating - 24 oz

4.5 4.5 out of 5 stars 1,511 ratings

Typical price: $35.83
This is determined using the 90-day median price paid by customers for the product on Amazon. We exclude prices paid by customers for the product during a limited time deal.
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Price: $30.91 ($1.29 / Ounce)
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24 Ounce (Pack of 1)
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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

Frequently bought together

This item: Smooth-On XTC-3D™ 20 Mold Making & Special Effects Silicone Rubber, 3D Print Coating - 24 oz
$30.91 ($1.29/Ounce)
Usually ships within 6 to 7 days
Ships from and sold by Smooth-On, Inc..
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$18.99 ($0.54/Ounce)
Get it as soon as Tuesday, Nov 12
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Sold by OVERTURE 3D and ships from Amazon Fulfillment.
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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
  • Customer Reviews:
    4.5 4.5 out of 5 stars 1,511 ratings

Important information

Directions

Mix two liquids, brush the mixture onto the 3D print, and allow it to cure.


Product Description

Smooth-On Brushable Platinum Cure Silicone Rubber
Smooth-On XTC-3D
3d print waterproof coating
resin coating finish
3d print coating epoxy
self leveling top coat
XTC products

Looking for specific info?

Customer reviews

4.5 out of 5 stars
1,511 global ratings

Customers say

Customers like the product for its ease of application and smoothing effect. They mention it works well, is simple to use, and great for smoothing 3D prints. Some appreciate the value for money. However, some customers dislike the smell and have mixed opinions on the finish, durability, and sanding quality.

AI-generated from the text of customer reviews

102 customers mention "Works well"84 positive18 negative

Customers like the product. They mention it works well, is very happy with the results, and adheres to PETG. Some say foam brushes work really 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 end result is going to be good, but the "eliminates 90% of finishing work" moniker really gives you the wrong impression...." Read more

"I use XTC 3d to smooth out print lines. It works very well for this purpose. I used it most recently for a 1/4 scale figure print (pictured)...." 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

70 customers mention "Ease of application"50 positive20 negative

Customers find the product easy to apply. They mention it's simple to use, goes on super easy, and sands down in no time. The instructions are good and the material safety information is helpful. It takes much work out of having to sand large prints. The mixing is simple to eyeball for the tiny amounts used on miniatures.

"...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

"...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

"...Everything will be fine, then it will heat up, clump, harden in seconds. The foam brush adds to this!..." Read more

37 customers mention "Smoothing effect"37 positive0 negative

Customers like the smoothing effect of the product. They say it's great for finishing 3D prints, making them shiny and smooth. Some mention that it makes all the layer lines smooth.

"...bumpy texture and with this you only need 1 or 2 coats to get a super smooth surface!..." Read more

"It definitely smooths prints out. Make sure you use thin layers...." Read more

"...Anyways i bought a second one and it's Fantastic for smoothing out Prints" Read more

"This is basically a two part epoxy, formulated to brush onto 3D prints. Here are some observations I've had:*..." Read more

27 customers mention "Value for money"21 positive6 negative

Customers appreciate the value for money of the hair styling agent. They mention it's a great product, and an acceptable alternative. Some say it's great as a primer for Worbla, which tends to have 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

"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

"...Worth the price, and I'm sure it has very strong applications...." Read more

"...looking for a low viscosity 'dip' sealant, but this was a very acceptable alternative...." Read more

76 customers mention "Finish"47 positive29 negative

Customers have mixed opinions about the finish of the product. Some mention it looks shiny and makes prints smooth, while others say it's still tacky and leaves their prints very shiny.

"MY LORD. This stuff is super cool!I did not use this to coat 3D printed parts. I personally use it for cosplay purposes...." Read more

"...Almost TOO PERFECTLY. When Smooth-On says you need a very thin coat of this, they MEAN EXACTLY THAT. You only need very little...." Read more

"...If you don't do this, it dries smooth but lumpy and takes a ton of sanding to look good...." Read more

"...of it and worked with more manageable surface areas, this thing looked beautiful and it made my prints super strong...." Read more

37 customers mention "Durability"21 positive16 negative

Customers have mixed opinions about the durability of the product. Some mention it's very durable and shiny, while others say it falls apart in 30 seconds, the foam brush tears apart, and the mixing cup that is included is flimsy.

"...It mixes very easily, lasts quite a while on the plate, goes on well, sands easily, and has almost no smell...." Read more

"...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...." Read more

"...It also provides a tough order coating." Read more

"...The mixing cup that is included is flimsy and not very strong...." Read more

35 customers mention "Sanding quality"15 positive20 negative

Customers have mixed opinions about the sanding quality of the hair styling agent. Some mention it provides good smoothing with minimal loss of detail, while others say it's rough and creates a fine resin powder.

"...If you don't do this, it dries smooth but lumpy and takes a ton of sanding to look good...." Read more

"...pieces etc, I think this works well to give your foam pieces a smooth glossy finish...." Read more

"...coated with thin layers and left it to dry for about a week and sanding it is rough, probably because I was hand sanding the helmet...." Read more

"...Completely smoothed out and feels like glass with zero sanding. Awesome and a massive time saver for large prints...." Read more

28 customers mention "Smell"8 positive20 negative

Customers are dissatisfied with the smell of the hair styling agent. They mention that visible fumes were coming from the cup and they were pretty noxious. Some say the product is toxic and ruined everything it touched.

"...today the B bottle leaked, rotted the sponge applicator, and smelled like a dead fish.2) I have never seen anything work this well...." Read more

"...While the liquid product smells terrible, the dust is far worse...." Read more

"...quite a while on the plate, goes on well, sands easily, and has almost no smell...." Read more

"...sandable- paintableCons (ish)- strong odor, work on ventilated area, prefer outside-..." Read more

Works as advertised.
5 out of 5 stars
Works as advertised.
I use XTC 3d to smooth out print lines. It works very well for this purpose. I used it most recently for a 1/4 scale figure print (pictured).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. You want to avoid leaving it in the cup to reduce heat build up and fumes. I like to spread it thin on a piece of cardboard or plate for the best working time. Mixing the right ratio is key to hardening like any two part resin product.Drips will occasionally happen but they can be shaved or sanded down with little effort. I recommend thin layers to see how much detail you can preserve and still get most of the lines out . Overall I highly recommend xtc 3D for 3D prints. It fills layer lines very well for a smooth look once painted. It also provides a tough order coating.
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Top reviews from the United States

Reviewed in the United States on February 6, 2017
Size: 24 Ounce (Pack of 1)Verified Purchase
MY 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!
14 people found this helpful
Report
Reviewed in the United States on August 17, 2024
Size: 24 Ounce (Pack of 1)Verified Purchase
1) Make sure you check it when you get it. I picked it up back in April then we got busy with summer and when I opened it today the B bottle leaked, rotted the sponge applicator, and smelled like a dead fish.

2) I have never seen anything work this well. It does exactly what it says and if you can brush liquid on a surface and mix 2 parts of one bottle, one part of another it literally does the rest. Due to the dead fish smell previously mentioned (I suspect the rotting foam applicator) I was not overly precise applying it.

Completely smoothed out and feels like glass with zero sanding. Awesome and a massive time saver for large prints. But make sure you check it for leaks when you get it.
Reviewed in the United States on July 27, 2018
Size: 24 Ounce (Pack of 1)Verified Purchase
Overall 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.
22 people found this helpful
Report
Reviewed in the United States on January 7, 2024
Size: 24 Ounce (Pack of 1)Verified Purchase
I use XTC 3d to smooth out print lines. It works very well for this purpose. I used it most recently for a 1/4 scale figure print (pictured).
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. You want to avoid leaving it in the cup to reduce heat build up and fumes. I like to spread it thin on a piece of cardboard or plate for the best working time. Mixing the right ratio is key to hardening like any two part resin product.
Drips will occasionally happen but they can be shaved or sanded down with little effort. I recommend thin layers to see how much detail you can preserve and still get most of the lines out . Overall I highly recommend xtc 3D for 3D prints. It fills layer lines very well for a smooth look once painted. It also provides a tough order coating.
Customer image
5.0 out of 5 stars Works as advertised.
Reviewed in the United States on January 7, 2024
I use XTC 3d to smooth out print lines. It works very well for this purpose. I used it most recently for a 1/4 scale figure print (pictured).
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. You want to avoid leaving it in the cup to reduce heat build up and fumes. I like to spread it thin on a piece of cardboard or plate for the best working time. Mixing the right ratio is key to hardening like any two part resin product.
Drips will occasionally happen but they can be shaved or sanded down with little effort. I recommend thin layers to see how much detail you can preserve and still get most of the lines out . Overall I highly recommend xtc 3D for 3D prints. It fills layer lines very well for a smooth look once painted. It also provides a tough order coating.
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Customer image
Customer image
7 people found this helpful
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Top reviews from other countries

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Marcel N.
5.0 out of 5 stars Easy to work with
Reviewed in the United Arab Emirates on October 8, 2024
Size: 24 Ounce (Pack of 1)Verified Purchase
Dries nicely
Splinter
5.0 out of 5 stars Caro pero efectivo
Reviewed in Spain on July 20, 2022
Size: 24 Ounce (Pack of 1)Verified Purchase
Aunque 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.
Lydia
5.0 out of 5 stars Trés bon produit
Reviewed in France on February 3, 2021
Size: 24 Ounce (Pack of 1)Verified Purchase
J'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.
C Thomas
5.0 out of 5 stars Bon produit
Reviewed in Canada on February 16, 2019
Size: 24 Ounce (Pack of 1)Verified Purchase
Ne pas en préparer trop car possède une bonne couvrance.
St.G
5.0 out of 5 stars Bin zufrieden
Reviewed in Germany on March 19, 2020
Size: 24 Ounce (Pack of 1)Verified Purchase
Gefällt mir gut bei mein 3d druck