Bottom paint removal

[Drivewayboater2]

What is the best way to remove bottom paint? I’ve seen everything from oven cleaner to scraping to sanding being discussed. Any thoughts/suggestions? I’m reviving a 1990 2651 Bayliner. Looks like there’s several coats of various paints. I don’t think the PO(s) took the time to do it right and just kept slapping paint on.
That said, how much must/should be removed before new can be applied? Any help would be appreciated

 

[alldodge]

The best way is to pay someone to remove.

Otherwise, you can use paint stripper and then scrape or a power wash off.

Once off, it needs to be sanded with 80 grit before paint can be reapplied. It can be sanded down to the barrier coat before new bottom paint is applied. The barrier coat may also need to be applied prior, depending on what you find.

If you strip it all off down to the gelcoat or fiberglass, can apply epoxy paint, that is if there is no plan to replace bottom paint

 

[Chris1956]

I tried paint stripper, but never had any luck. I always ended using a 36 grit sanding wheel...

Unless you are real careful, you will want to apply an epoxy barrier to cover the scratches in the gel coat.

 

[saaristo]

My experience is that by a mile the best possible solution is soda blasting. First, you don't need organize a small Chernobyl in your backyard. Second, no risk of sanding too much or into lifting strikes. Third, you will have a uniformly clean smooth surface in the end. Fourth, you will have a perfect surface for following painting steps. Believe me, thats the way to go even if it sounds expensive you'll thank me later :joyous: