I sanded the corrosion smooth on my frames and painted with black Signature. It scratches easily, but is also easy to touch up. I was told I should have etched and primed the aluminum. Regardless, touch up paint is easy.
Signature can be easily brushed or rolled to get a very smooth finish, which is much easier and more controlled that spraying. Cleaning up overspray that drifts and is electrostatically attracted (like to a nearby car windshield) can be a royal pain.
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1974 23' Tsunami, fully refurbished, custom pilothouse, Hermco Bracket, 250 Etec
1977 23' Sceptre fully refurbished, soft top, I/O
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