I too would like to know the best way to remove old bottom paint. If possible, I dont want to damage gelcoat which may or not be good though I assume it will be.
The paint is VERY old, the kind they quit selling YEARS ago. While using mild acid to remove brown stains, it would remove the paint too. I would rather not sand.
Heres a couple pics of what I mean
The rear area is probably the sparsest though the hull has hit and miss areas too