Not sure if this is a well known solution for venting your shrink wrapped boat or not. I just discovered it courtesy of google.. I went down to my boat a few days ago to cut in an access door into the shrink wrap. When I got inside the shrink wrap was litteraly dripping with condensation. The shrink wrap guy did put some slats in the wrap up at the bow but they weren't letting air circulate. The solution is just these antifreeze jugs.. Put one in on each side as high as I could reach. Seems to be working.