A thick coat of Henry 430 acts similar to a butyl rubber.
Takes a while to dry if laid on a thick layer.
It does not ever harden so wont crack. very water
resistant, I put some underwater and it did not redissolve although the surface of the glue turned white after a few days, it stayed soft and gummy.
I use it as a low strength adhesive
When dry and thick like a soft sticky gum.
Dries to a tan color, stays very stretchy and rubbery.