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Smooth-On

Mold Star Pourable Silicone

$59.99 incl. GST
$59.99
Sale Sold out
  • Trial Size Unit — (0.91 kg.)
  • 1 Gallon Unit — (7.26 - 8.16 kg.)

Easy to Use Silicone Mold Rubber

Mold Star™ silicones cure to soft, strong rubbers which are tear resistant and exhibit very low long term shrinkage. Molds made with Mold Star™ will last a long time in your mold library and are good for casting wax, gypsum, resins, concrete and other materials. Cured Mold Star™ rubber is heat resistant up to 450°F (232°C) and is suitable for casting low-temperature melt metal alloys.

NOTE: This product will not work with modeling clays containing sulfur under any circumstances.

One to One Mix Ratio

Mold Star™ rubbers are mixed 1A:1B by volume (no weighing scale necessary) for precise measurements even at a very low mass and cure at room temperature with negligible shrinkage.

No Vacuum Degassing

Mold Star™ silicones feature relatively low viscosities making vacuum degassing optional and is not required for most applications. A uniform flow will help minimize entrapped air.

Translucent Options

Make Fast Cut Molds or Castings

Mold Star™ 19T, 20T, and 31T are translucent silicones for making fast molds or casting into alginate molds. They offer fast cure times, multiple hardnesses, and an infinite number of color effects achieved by adding Silc Pig™ silicone pigments or Cast Magic™ effects powders.

Customer Reviews

Based on 23 reviews
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Chris B
Super simple

Recommended by ResinCraft after I was having severe pot life issues with a semi-industrial product. The trial kit is pretty small, but it captures a very 1:1 negative right down to the striations in 3d printed parts, seems very hard wearing and the part just about fell out of the mold when cured.

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Ian C
Great Product

Exactly what we needed, ResinCraft communication was excellent.

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Lou Hocken

Smaller quantities would be great if available.

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Bruce Cooke
Good stuff, but packaging is a nuisance

An excellent mold making silicone. cures evenly and the surface resolution is brilliant. I've found if you pour it carefully,and vibrate the mold slightly, I've never had air bubble issues and never needed vacuum. A couple of fairly minor niggles - The packaging sizes are a pain - the small size really is a bit too small for many of the jobs I do, and the gallon size is far too big (and expensive. Also, the small size pots are really impractically proportioned - long and narrow, its really hard to stir each component of the product before mixing (since is very viscous, you need a broad stirrer, which has limited space in a narrow container). You also end up with a lot of wastage stuck down at the bottom. needs much broader and easier to use packaging, in a 2 Litre size.

Very interesting review perspective! I'll be sure to pass this on to the Smooth-On team on your behalf.

I'm glad the product works well for you though :)

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Bruce Philip
It's good

Good silicone. I wish I'd used a vacuum chamber to de-gas, it was full of bubbles even though the info says it doesn't need de-gassing. Luckily I brushed the surface with the silicone first so it wasn't too bad at all. Possibly user error but I'm not sure there's anything I could do to alleviate the bubbles

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