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Jim,
I sand my bottom with a random orbit sander with nothing finer than 60 or 80 grit. The key is to get the surface of the old paint scuffed and knock the loose stuff off.
I then coat with just 1 good coat of bottom paint. I think I have been using interlux ACT or ACP...it is one of those ablatives.
I think ablatives of any brand can probably go over each other, you can do a test spot.
I just never go too crazy with the whole process. Please don't let people convince you that you gonna slow the boat down if you don't say take it all off etc. This isn't rocket science.
Oh and wear a good dust mask when sanding, a respirator is even better. ONce I just wrapped a t shirt around my face once and blew stuff out my nose for a day for I got lazy and didn't go to the store. Probably took 2 fishing seasons of my life.
Jon
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