ASA and PSIA Instructor
Join Date: Apr 2000
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Paint chips like that when it gets thick, a barrier coat need have nothing to do with it. With that much paint, I'd be surprised if there is a barrier coat under it - I don't think they were in use many years ago...That's the magice with ablative paint, it wont build up - just repaint as needed.
If you decide doing it by hand is too painful (as it is...) you might get a quote for blasting - maybe a local guy wil be doing some other boats and giver you a deal..