Get a tent patch repair kit, they're cheap and many come with a waterproofing solution. You want something meant to stand through weather or you'll be replacing the tape eventually.
I used duct tape to fix my last blind, that was 3 years ago, sat out for alot of a winter and is still well intact. As long as you apply the tape when the blind is completely dry, it will probably last as long as you have the blind.. Dont underestimate the power of duct tape lol.
