Seakat do you leave boat on a mooring or slip? If so then the bottom paint should be removed by either a blasting media, sanded with orbital sander, or paint stripper. If you use trailer only no need for barrier coat waste of money. Also, yes you could just scuff up and recoat bottom but you may not be happy with the results. I just sanded 3-4 coats off my 20 SF was a PIA I now have a clean bottom and going to use epoxy trailer boat paint made by Blue Water Marine Paints. Hope this helps.
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