Paint over old paint?

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Ocean Spray

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If you have an ablative paint on your bottom, can you paint over it with the same paint? Or do you need to sand it down first?

My bottom was done a couple of years ago and it was soda blasted and primed and painted, can I just re-paint with like paint? Some areas are starting to show the yellow primer that was used and I know its time for a re-paint. Any suggestions?
 
If the old paint is tight and adhering leave it in place unless you have such a build up that it is adding excess weight to your boat. Based on having it blasted a few years ago that should not be your concern.

Read the label of the paint you are using. find a compatible paint thinner and wipe the bottom down prior to painting. This not only cleans the surface for a good bond, it also soften the existing paint and allows the two coats to bond togeather.
 
Call the paint vendor. I spoke with Pettit and they said scuff up what's there with 80 grit and then paint it.

MJK
 
Here's useful hint I got years ago from the folks at Interlux. With albative paints, it's a great idea to start with one color, and then top coat with another. The first time I painted my bottom, I used a light gray paint. Now I use a dark green. I don't repaint until I see gray showing through. But yes, follow manufacturers' instructions on how to prep, but ablative can be applied on top of similar ablative.
 
Generally speaking, with abaltives just powerwash any slime or other fouling off at haulout, let dry well, tape off the waterline or bootstripe and go ahead and paint with no sanding. In your case , if primer is beginning to show I'd apply 2 coats of new topcoat ablative A/F.

Edit; make that "ablatives" of course.
 
Interlux recommends light sanding of its ablatives before repainting. Its a lot cheaper to lightly sand every year, than have to strip the bottom every five or so . . .
 
Thanks for all the replies, ablative it is! Just have to figure out a weekend to put her on the hard!
 
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