Re: mold making question? [TANKS]

[Frank Pittelli <frank-at-rctankcombat.com>]

burn995-at-aol.com wrote:
> You guys who mave made a few things with "procast",molds and parts.What 
> is your mold release you use?  Is it a wax or a pvc film?

I haven't used "procast", but I've made quite a few molds and parts out 
of various materials (rubber, latex, fiberglass, plaster, sand) using 
release agents such as silicon spray, PVA (poly-vinyl-alcohol) film and 
paint thinner with vasoline.

In all cases, you should seal your plug (especially wooden plugs) 
extremely well using a couple coats of sanding sealer, wood glue or 
epoxy before attempting to make a mold.  For non-porous materials, like 
plastic or metal, there's obviously no need to seal the plug.  Then, 
apply a couple coats of liquid car wax.  Finally, apply the appropriate 
mold release for the material being used.  If you follow that approach, 
the mold will slip off "like butter" every time.

        Frank P.