I want to pass on some info on a product that I found that might be helpful to others.
Our water tanks
had several holes in them and were severely pitted. I have coated the inside of the tanks
with MACROPOXY 646 NSF. It can be special ordered from Sherwin-Williams. It is a two part epoxy
that is specifically made to line potable water
tanks. One of my employees used to work in a railroad yard and they used the product to coat the interior
of railcar potable water tanks. If it can hold up to the rattling of a railcar, it should do fine on a boat.