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post #2 of Old 06-17-2007
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Any paint can be removed with a solvent, that's what solvent does. So that's not a particularly good way to identify the type of paint you have. If the boat was trailered in the past, it likely has an ablative, as ablatives are able to withstand extended periods exposed to air, unlike other anti foulings.

Regardless, assuming it is not something exotic and assuming you don't intend to paint over it with something exotic, you can paint over it. Ablatives can go over ablatives or epoxies and conversely, epoxies can go over epoxies or ablatives. Generally just sand and paint. Here is the West Marine Paint Compatibility Chart for reference:

Bottom Paint Compatibility Chart
Old Paint to Remove
Modified ExpoxiesCopolymers & AblativesVinyl PaintsSloughing PaintThin Film PaintVivid &
Tri-Lux 33
Modified ExpoxiesSand & PaintSand & PaintSand WellSand WellRemoveSand & Paint
Copolymers/AblativesSand & PaintLight Sand
& Paint
Sand WellRemoveRemoveSand & Paint
Vinyl PaintsRemoveRemoveSand Well & PaintRemoveRemoveRemove
Sloughing PaintSand
& Paint
& Paint
Sand Well & PaintSand
& Paint
RemoveSand Well
& Paint
Thin Film PaintRemoveRemoveSand
& Paint
& Paint
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