Thanks, Dan. I hadn't thought about condensation -- that's another *really* good reason not to do that bagging routine.
Honestly, I didn't think it would come to that because, like you pointed out, these seat backs are obviously not going to be a battle; they are, from top to bottom, a straight run that gets wider as it goes down.
PS - I bought a compressor yesterday so I'm ready to use my glue gun!