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Message: <blockquote data-quote="TexasJim" data-source="post: 492194" data-attributes="member: 24649"><p>Douglas: Historically, aircraft builders used zinc chromate primer on their aluminum parts and structures. My boat was built in 1958, and still has some of the zinc chromate on it. I didn't bare metal any area that had good primer. It's kinda greenish yellow. I doubt yours has any. The bare metal was cleaned, degreased, etched with an acid, then the zinc chromate was sprayed on. True zinc chromate was found to be a carcinogen, so normal folks can't get it any more. Spray can zinc chromate isn't the true stuff. I bare metalled most of my boat's hull, then etched it with two vinegar washes, rinsed with water. I let it dry in the sun, then sprayed on the Martin-Senour zinc chromate primer I got from NAPA. It took two cans to spray my 14' boat's hull. And, I didn't do most of the bottom, as the original primer was still there. I used Tractor Supply Majic spray can paint for the color coats. It's been on there for 2-1/2 years, dunked in saltwater a couple of times a week, and is holding up fine. I just hose the boat off when I get home. The picture in my post about my flats skiff conversion was taken a couple of months back. That process worked well for me.  YMMV</p></blockquote><p></p>