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On a recenty finished guitar I made I noticed the pickguard lifting on the edges. when I looked closely I noticed the double stick tape was soft and gummy.
I removed the pickguard.
The pickgurd is celluloid nitrate and I used the tape for applying pickguards.

Any ideas why this would happen?

I have used the same process before with the same materials and have not had that problem.

I want to reapply it

.I completely scraped off the old tape from both the pickguard and the top so I am starting fro scratch-again....

Naphtha would have that effect on pickguard film adhesive, making it expand and soften...any chance you used naphtha around the guard to handle cleanup?

_________________
For the times they are a changin'

- Bob Dylan

It was a while ago, I might have done that..... can't remember.

I bought some pickguard adhesive from Stew Mac which after a couple of years stuck to it's own backing better than any thing else - apparently it does have a shelf life.

I suppose that the good news is that you are likely well on the way to removing the guard and regluing it with fresh film adhesive!

_________________
For the times they are a changin'

- Bob Dylan