2 coats of epoxy, each with different color tints in each to
make sure of coverage, and for later years re-do.
Then whatever primer / etc / etc as required for the antifouling.
When you grind back next time / s,
the epoxy color shows where you're down to.

FWIW

"Grumpy" wrote in message
u...
| I did similar and used resin to seal then a coating of gelcoat
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| "Dennis Gibbons" wrote in message
| . net...
| as long as you are down to gellcoat, epoxy barrier coat
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| --
| Dennis Gibbons
| dkgibbons at optonline dot net
| "boatalec" wrote in message
| om...
| Just finished scraping 15 years of bottom point with a straight edged
| putty knife to a 37' Jersey. Hull is white as a babies behind.
| Scraping caused some knicks to the gel here and there.
| Should I apply a coat of Ablative or first apply some type of sealer?
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