When restoring the Austin Healey many years ago ,on the interior I used 3M 77 and on all my Case Labels I use it also ! If I remember correctly on the directions on the side of the can it states something such as this , " For permanent installation spray a light coat on the piece to be adhered and also a light coat on the piece that is to be adhered to and let get tacky ,press together etc. for all other applications coat only the piece to be adhered ! On the Healey I sprayed both pieces and have never had a piece come apart ,on my Gun cases I Only spray the label with the idea in mind if I ever want to change labels or sell the case someone would be able to lift the label and add whatever they wanted , Fox, LC Smith Labels etc. ! And yes after a couple of years you may have to respray and replace as the corners seem to lift a bit with the single spraying technique but it doesn't pull the lining off of the case ,Just a Thought !
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