Joe,

I agree with Rob. The only benefit to adding zinc powder would come if you intended for the magnets to continue getting wet, but the benefit would be small.

Sam

: Hi All It has been awhile.... I looked at my kayak the other day and found
: the magnets on the hatches are rusted really bad, one just disappeared
: into nothing. I did fiber glass over them. So I had an idea what if I mix
: zinc powder in the epoxy and refiberglass over the new magnects with this.
: Do you think this will help? Thanks Joe