Fiberglassing question

[Breadstick]

Not sure where this belongs, but I'll just ask you gentlemen. I'm going to take my first foray into making a fan shroud out of fiberglass and have a question. I have my mold made, but I figure it should have at least two layers of the fiberglass mat for strength. Do I have to wait for the first layer to completely cure before laying the second, or can I just lay the second on top with a little more resin as soon as I lay down the first layer.

Also, I read somewhere that a layer of wax paper is sufficient to keep the mat from sticking to the mold. Is this true?