Under water tape. Vynal auto wrap. Clear packing tape.

[markstrimaran]

Need a temporary adhesive, to hold a divider in place, set up dry, but able to hold when submerged.
I have used some auto wrap underwater, for a while. Any regular tapes worth trying. Duct tape?

 

[J. H.]

I used duct tape to seal the holes in the lid for a sandbox so I could use it as a boat while I was in elementary school. The 'boat' held water well enough for me to get into a lot of trouble with it, but eventually, the duct tape sort of fell apart (the boat disappeared one night - I came to school and it was gone).

 

[M@T!@$]

Flex tape

 

[markstrimaran]

Scotch duct tape held, for about 10 minutes, a set of baffles. Had to test an idea, before using a permanent adhesive.