On Mon, 9 Mar 2009 06:50:34 -0600, Dan Kuechle wrote:
Need some waterproof glue for a small project out of treated wood,
Plexiglas, and ceramic that will be underwater. Epoxy seems to only last 6
months to a year before it looses its grip. Anything better? I don't need
much.

Epoxy is a filler. If you want something to be held by epoxy, you have to
make a form and have the epoxy surround both objects.

You'd do better to use screws/clamps/etc. What are the shapes involved?