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Old 04-05-2024, 10:14 PM   #1
Lt. JG
Join Date: Mar 2023
Posts: 38
Default Bottom Paint Repairs

Hello again!

I'm planning to repaint the bottom of my boat. Freshwater only. In the water full-time from May-Oct. I know I have to sand off the old paint, but I'm curious about a handful of chips. Should I just sand those beyond where it is chipped and paint over it, or is some sort of filler necessary? If so, what kind of filler?
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1994 Maxum 3200 SCR w/5.7L Bravo IIs & 3kw Onan
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Dream boats (smallest to largest): Regal 38 Grande Coupe, Prestige 420S, Cruisers 46 Cantius, Princess V50, Sunseeker 100 Yacht, Mangusta Gransport 54
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Old 04-06-2024, 02:31 PM   #2
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Join Date: Feb 2012
Location: Essex, Maryland
Posts: 10,282

I can’t tell from the picture but if the chip goes into the gelcoat it should be filled with epoxy resin.

1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2

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Old 04-15-2024, 02:09 PM   #3

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If that is just a chip in the bottom paint, then sand the edges and fare it smooth, then do a couple of coats of touch-up before the bottom is repainted.
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Old 04-17-2024, 05:35 AM   #4
Lt. Commander
Join Date: Mar 2017
Posts: 115

If you’re in 100% freshwater, the bottom paint becomes mostly cosmetic. It doesn’t offer any fiberglass protection, just keeps the scum line away. If anyone else feels different, please correct me, but I’m also in freshwater with a boat that has the bottom paint curse and it really doesn’t matter too much how it’s maintained. I started a new maintenance routine that only includes what you can see while the boats on plane :-). If the surface is really rough, there is a potential for performance degradation due to friction and it might make sense to fair the edges of any chips. The only reason to make it look good under the waterline is if you want to impress people while it’s on the trailer or jack stands. If you do give it another coat, make sure it’s compatible. Soft ablative can be applied over hard or soft. But hard will fail if applied over soft.
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