I've got a white Kenner. I use it a lot on the central Texas Lakes
which are of course saturated with limestone. Then I go down to the
Gulf Coast. Next thing I know I've got this brown stain on the bottom
of the boat. I can remove it by rubbing HCl (swimming pool acid) on it
and rinsing off. I am wondering if there is some kind of wax that
would help prevent this stuff from sticking onto the gelcoat to begin
with. Any one have any recommendations?

tks

Don