Mold rubber and resin

[porschercr]

Alumilite™ Amazing Casting Resin

Amazing Mold Rubber (Pink box)

Alumilite Mini Casting kit.

 

What are the differences in the types of mold rubber and resin's, if any.

Thanks,

Trevor

[Rick L]

There’s not much difference between RTV (room temperature vulcanization) rubbers except for their curing agents, tin and platinum and they are not compatible to each other. This should not be a concern to your needs as long as your using the same product. The only thing that sticks to Silicone rubber is silicone rubber. 

I think your main concern should be in the resin used. The casting resins offered by Smooth-on are polyurethane. All of different durometer. Some are fast curing, within 5 minutes and others are slow, within a few hours. Some need vacuum assistance to get bubbles out before pouring into mold and others can be put under pressure to minimize bubbles. 
So to answer your question you need to know what your needs are. 
The Smooth-on corporation sells mold rubber, casting resins and all material needed with tutorials on each of its products. 
 

This is not a plug for the Smooth-on company. It’s just that they are close by to me and are adequate for the hobby. If you want to go industrial, you can by it from Dow chemical or G.E. in 50 gallon drums. LOL.

Edited August 30, 2021 by Rick L
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