While I do not own a boat nor have any experience with wrapping vs. not
wrapping a boat, I was just reading about a new product meant to help
with moisture buildup do to shrink wrapping. "Dr. Shrink's DS-683SP
self-adhesive vent with a high speed solar-powered fan". There was
very short write up about the product on page 157 of the Sept. issue of
Cruising World.

Please do let the list know what you find out about shrink wrapping.