A FWIW--before you start applying adhesives, make sure you really know what material you're working with; is it truly "Plexiglas", or is it Lexan? To the layman the word Plexiglas has come to mean virtually any clear plastic sheet, like any facial tissue is a kleenex. Plexiglas is an acrylic, Lexan is a polycarbonate. The ONLY similarity is that they're both plastic-like material, and generally used in a transparent form (both are sold in hardware stores for use as windows). One can be thermal-formed, the other cannot. One will actually absorb the energy from a .50cal round, the other will break apart. Plexiglas doesn?t machine well, it?s too soft (it also scratches relatively easily). Lexan machines quite well because it?s incredibly hard, but that also translates into brittle. If it truly is Plexiglas, epoxies won?t even work well, you need to mechanically attach the metal to it via bolts, screws, rivets, etc., and you need special drill bits for it. If you were joining Plexiglas to Plexiglas, it?s not ?glued?, but a chemically welded joint like PVC pipe. Confused yet?