Good luck, Dan
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That’s what most builders I know use, pva so it’s safe and it’s slightly flexible.
Oh, and it's thick white to start with and dries clear.
Looks and handles just like the white glue you get with some refoam kits.
It is the same without the high "audio" price tag. Along with many others. They have to be water soluble so they don't eat/melt the foam surrounds