It seems like the 3M stuff is pretty expensive, and I assume the Ford stuff about the same- AND I have to go find it, order or get to a store. ...by default I'm just thinking the other way on this one...any reason I can't just use the typical household bathroom or exterior window caulking? I don't see why that wouldn't work fine and I already have a bunch of that in my garage...or is there somethiing suitable I can get at Home Depot when I buy the plastic? (and if I ever need to go back in...I'll still have tubes in my garage and probably plastic left over too.).