what i mean is, i have a thin plastic “tray” that i think would make an excellent mold for a base for figures. i was thinking i could just pour the resin into it and since it is already tapered on the sides it would act as a natural draft angle when cured. but i dont want to do it if it will eat the plastic or stick to it and not come out. was jsut thinking out loud with this guys…but some advice or comments would be greatly appreciated. in other words…let me know if im being foolish! [(-D]
You still need to use a mold release.
Doesn’t “Pam” work for a release agent?
Yes, but your mold will smell of butter.
Bare-metal-foil makes a release agent, but you should be able to get one anywhere that sells RTV and resin.
You can make your own by dissolving Vaseline in mineral spirits. I’ve done it. Now I buy the commercial stuff.
Gotta say, it depends.
I have a clear vac-form lid which was on a Folgers coffee can (over the normal seal) which I use as a tray to load the resin-filled molds into the vac chamber. Flex the plastic and the resin spill-overs pop right off.
Most of the resin casting I do is small stuff. I measure and mix my resin in small 2 oz condiment cups which I bought at the local restaurant supply company. Again, the resin will come out of these cups with not too much trouble.
While Triarius’ response to use mold release is certainly a valid one, the choice of plastic may make its use un-necessary.
Oh, and I tried Pam on a two-part mold when pouring the second piece of RTV. The two RTV parts fused together and I had to cut the mold apart to rescue the master and retry using proper materials