My
dinghy used to have a painted bottom, it's a necessity if you leave it in the
water all the time. But... I have a hard dinghy and store it upside down on
deck if I am not using it while in a marina or underway. After a summer docked in
Texas, the frequent rains caused the ablative
bottom paint to leach green stains from the copper onto my
cabin top and side decks. Now I just hang it on the side of the
boat when I am anchored and it only goes in the water when I am using it, no bottom
paint needed.