Molding clay

[3rdday]

Originally Posted by mnwnvc

I have been told that you should use a low sulphur clay when making silicone molds. Do not know if there is any reason to apply this advice to epoxy or glass. Sulphur in the clay can effect curing of silicone.

On the right track, it should be a NO sulpher, especially if using a polyaddition/platinum cured silicone. It will definitely cause cure inhibition and you will havea sticky freaking mess, and nothing will solvate unreacted silicone. Isopropyl alchohol will help with wiping up the mess but you will have to use many cloths, papertowels, wipe once discard, repeat, repeat, repeat. if you do not you will just transfer to many other places and you will not get rid of it. if it ever ends up on a surface to be painted or gelcoated, you will have an adhesion issue.

Klean Klay is a commonly used clay which contains no sulpher.