I have experience casting fibreglass canoes. When I cast a canoe I first coat the inside of the mold with Gelcoat for a smooth, fibre-free exterior.
I am planning on casting some little plaster/resin trinkets, that I will mold in silicone. I would like to reinforce these with fibreglass or copper wire.
How can I coat the inside of the mold so that I have a smooth, fibre-free exterior? Is there anything else I have overlooked?