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Sounds like some steel wool got used on or near your boat.Hey! I've got a few of those tiny, almost pinpoint rust spots scattered on my non-skid, too. Located only in the wettest deck zones. Decided they were't biological as even bleach didn't alter their appearance. So, is it a spot of rust? An errant grain of iron in the new sand/Awlgrip non-skid? Somehow exposed to moisture under the final coat of paint?
What does oxalic acid neutralize?