Hey Tmickley,
Basically I just heat the polyester casting resin and add it to whatever I am making, rag ,paper etc.I let it soak well into the medium and the add the catylist and stir.I use the minimum amount of catylist that allows the slowest cure. I pour the mix into any makeshift mold and degass it in a vacuum chamber.Its a lot of fun because it never looks like what you expect it will, I am lucky as Deb happens to like the smell.
Mark