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I’m about to work on my beats and I was wondering what adhesive I should use, that will be watertight and removable when I heat it.

Any silicon based glue will be waterproof and they will not require heat to remove . Any[ https://www.google.ca/search?q=rtv+seala…:| rtv sealant similar] to these. You can also try Goop. Its a very durable sealant that’s waterproof. Hope this helps