Once the leaves fall to the ground and the first frost chills the morning, it’s a good time to store your boat for the winter. Wrapping it up in plastic is one of the best ways to keep it safe and dry, but the job isn’t done after you’ve shrunk the wrap with a heat gun. Without vents, the plastic shrink-wrap will trap condensation inside your boat, a surefire way to cause mildew and mold problems. Plus, you have to allow access for the fuel tank to breathe through its vent. And if you want to access your shrink-wrapped boat at all, maybe to do some off-season maintenance or to hide out and drink a beer, you’ll need to add a zipper door. The good news is that this is the easy part. Here’s what you need to know.