For water effect I use Loctite GO2 glue. It comes in a fairly large container and has about a 30 minute cure time.
So I'll paint it in varying shades of blue to give the illusion of depth. Do a light dry brush of metallic blue. Then put a coat of the glue on. When it dries I add a clear coat to make it a bit harder and prevent things from sticking to it.
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