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As wade mentions if you are going to refurbish your boat you need to get all the old finish off if its been painted. Media blasting is a good way to go, a lot faster than sanding and grinding, but more expensive. Then you must repair any damage to the hull, and decide upon painting or re gelcoating. Cleaning products mentioned in the post above won't cut it for an old Whaler. They won't remove spider cracks.

rich