Last month I finished a Princeton Reverb build. Unfortunately, I listened to the people who said spray adhesive like 3M 77 would hold tolex. I don't know what magical land these people live in (though I am jealous of them). I've read plenty of comments from people who will swear it holds. There must be special mojo in certain cans of 77 or something. The tolex was put on a couple weeks ago, the glue is still very gummy. I'm pretty sure I could peel the tolex off the amp, slowly and carefully. Is there any reason (chemical or otherwise) that I can't switch to contact cement and use the same 4 pieces of tolex? I'm thinking I'll use a citrus cleaner to remove the 77 anywhere the tolex overlaps and make sure the cleaner dries before reapplying the tolex. I know we're only talking about maybe $30-40 in tolex, but I'd rather use what I've got if possible.