Normally I use J-B Weld epoxy but some older guys swear there is a "Marine Epoxy" that is way stronger and better than any other epoxy. I've used Devcon, Permatex, etc., and see there are a number of marine brand epoxies available just don't know which one they are talking about? They say it's much stronger than any J-B procuct even the J-B Marine Weld.

Would anyone happened to know what Marine Epoxy is the strongest available........trying to fix a magnesium cover that has a water pump in it. TIA.