just my five cents: I never shrink wrapped when I had wooden boats - heard to many bad things - I usually just had a Winter Cover to protect from the elements over the mast
which was laid on top of the boat. Ensure no chafing where it touches the Hull
. And that was back in Switzerland with quit an amount of snow and deep temperatures.
When I was in the market for a "plastic cruising" boat in the US all the boats I checked out which where shrink wrapped have been a disaster. Mold
everywhere and usually very smelly. I know you can avoid that when you take care to ensure good ventilation but I never saw it actually working.
I cam to the conclusion that I never would shrink wrap, waste of money
, better buy a multi season winter cover. Should pay itself after a while and ventilation is simply better.