Originally Posted by backpacker3
The tape I bought is a clear tape made for outdoor use and is supposed to be waterproof. The only differance I can see from the 3M Brand is the price, a lot less money and if it does the job, I come out with a few dollars in my pocket.
The 3M branded product used by the factory for sealing window seams in addition to caulking them, and which some users are applying themselves or having their dealer apply as an extra precaution against leaking, in no way resembles the clear Duck brand tape you are considering using. The 3M product isn't a tape at all really, it's a soft 80mil thick membrane with a special adhesive on one side and a peel-away backer on the other. My concern with a tape-based product is, if it does not perfectly seal the area being covered, it will do exactly the opposite of what you intend, which is to say, trap moisture beneath it, against caulking you can no longer maintain.
I'm fine with people improvising solutions and coming up with new ways to solve problems, but I'd recommend against this one merely to keep a few dollars in your pocket.