Re: bottom paint
You only need antifouling paint if the lake will grow slime. It would be best to check with other boaters who use the lake. If no slime, you can go back with two part polyurethane or an epoxy paint. This solution requires the boat be stripped to bare gelcoat.
if you need or prefer antifouling paint, powerwash what you have and roll some new paint over it. Prime any bare spots with a marine primer. Standard ablative paint is a bit better than std AF paint, and will work fine. There are some hard AF paints, that take special prep.
