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I've tried using both the 3M and Napa Brand Spray Adhesives, both with little luck to fix several sagging spots. I am sure both would work fine with new material and the liner board out and cleaned, but for a repair to a specfic area trying to get the old stuff back up, they both made a bigger mess than I had before.
The problem is the left over rotting foam backing on the old material, and the bits of foam on the board...makes for a really poor bond...no matter how much you adhesive you blast in ! I dumped almost half a can in one 10" x 10" area, and held it with pressure for about 20 minutes...looked great...for a day...until the next layer of foam let go!
Good Luck!
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