garys

Randy prooved a good point. While using a vacuum bag or ton of weight can help, properly done, must less weight can also lead to successful wings. I've personally used everything from very thin industrial carpet tape, to a vacuum system to sheet wings, and all worked. They each had different advantages/disadvantages to the others, but they all got the job done.

I believe the original question was can it be done without a vacuum bag..and the answer is...yes.

Ed,
If you just pulled a vacuum of 4psi on an empty bag without a wing in it, how much vacuum pressure would it have holding the two sides of the bag together?