Yes, you're right but I said epoxy is ONE of my favorites
Silicone is an other one...
Unfortunately I have no tip for silicone apart from the warning when using silicone as demoulding agent for polyurethanes. This could result in a splendid blowing of the PU (some solvents used in silicone could react as fysical blowing/foaming agent).
Need no picture of what is looks like when you intend to mould something and it finally turns ou to be 10 times the original size
