First of all, if your hard paint is is still good, you wont have to haul. Hard paint releases it''s copper without the paint wearing away-you can have all paint but no copper! The paint can then be sanded ''til the cows come home but it won''t do any good, the copper is gone. So then, you will have to haul to re-paint.
With an ablative paint, the paint wears away as the copper is released- when the paint is gone, the copper is gone.
With a hard paint, each time you apply, you have to sand off the old paint or it will build up. If you don''t sand, sooner or later you''ll have to strip the bottom because there''s just to much build up.
Alot of sailers use hard paint because it''s cheaper, but when you have to pay someone to strip the bottom, there goes your savings. Some think it protects better but I think it''s a big pain. The savings aren''t worth the work.
If you can... haul your boat... strip it... and only use ablative paint.
You could apply ablative over hard but I suggest you get rid of the hard.
At any rate... good luck.