I thought that is what everyone did.
Knock back any flaking bits, bang some primer on any spots that are back to glass and roller on a couple of coats of whatever anti-foul you think should go over your old one without issues.
When the bottom paint
builds up too much for a light sand, well, you will probably need to service
the winches by then, and the motor
. Time to sell the boat!
Well that seems to be the case with all the boats I've bought anyhow.