Lou,

I'm sorry but I have to disagree.

While WAX can be used alone, PVA NEEDS to be used on top of wax. It will not melt the wax if a proper molding wax is used, like partall number ten paste wax (greenish blue).

Also, polyester will NOT melt molding wax. I made a polyester mold two weeks ago using only molding wax, no PVA.

Also, PVA is not a wax. It is a plastic film-like barrier that protects the reactive mold surface from epoxy. It is applied with an airbrush, left to dry, and when the part is released (full cure), it can be peeled off in a film (like saran wrap) or washed off with warm water.

Also, if you apply a coat of epoxy (no reinforcement), you should apply the reinforcement when this coat is STILL TACKY, to form a better chemical bond. If you wait for full cure, the prescence of amine residues will make the bond weaker, and it will be purely mechanical and not a chemical bond.

OH, and for molds, I use a polyester gelcoat, thickened using fumed silica (aerosil or cab-o-sil) and tinted with red ochre powder.

Have fun!