Originally Posted by acerc

Hold it against light where you can see the reflection of the surface. PoP will yield a glass finish but anything in or on the surface will show. When you pull the PoP you will know with out a doubt because of the (literally) glass finish to the surface. For me the final sanding needs to be wet sanded with a much finer grit, I would say 300-400. And to really make sure of a smooth surface mix up a last batch of finishing resin, with a good brush ready, warm the resin and apply quickly. This (warmed resin) will flow out to a glass surface finish, no sanding, no paint, and no primer required.