micro,
check out this post.
http://www.tinyrc.com/forums/showthr...&threadid=9366
it lists many of the supliers of resin casting materials. I have also posted on all of the different materials that i have experienced with. some are a lot cheaper than others and produce the same results..
so far the cheapest ive found is the tap plastics RTV casting rubber. its a straight up 50:50 mix. and has no harsh chemical smell... although none of the ones ive tried have had a harsh smell... it is not silicone. it is slightly firmer than silicone. the specs for it are on tap plastics site..
i am a tap plastics fan because i live near a tap plascics and can go in and have questions asked by the people that do this for a living. its also one of the cheapest that ive found out there.
Micromark makes a great quality product also. but i was on a budget...