I hope that you got your original question answered? If not, I would barrier coat anyway, acts as a primer and cant hurt if your thinking of keeping her in the water for even part of the year.
If you do this, it is imperative to remove all contaminates and bottom paint so that you get a good bond. Another tip would be to apply the first coat of bottom paint before your primer/barrier coat is cured, approx 3-4 hours after.
Tartan 37 - S/V Windgeist
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