I should point out the importance of letting the resin do the work for you. Depending on how hot you mix it, you usually have a good half hour of working time. For me this is forever compared to the stuff I usually work with, which can go from a water like thickness to completely solid and burning hot in 5 minutes.
So you really want to saturate the fiberglass. Then, step away for 5 or 10 minutes, let it soften up and absorb every bit it can. Then, you can roll out air and wrinkles without a thought. If you have a little spot that seems to have air or a foam type layer that you cant get out, more resin! That spot is just too dry.
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