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No, I didn't tape off the fins. I just painted them and then took the paint off the edges... don't even remember what I used now (1978 was a long time ago). Taping all the stuff is a pain, but the details are what makes it or breaks it, so take your time and it will pay off. One trick I use on cars for hoses and wires that I don't want paint on is to just wrap them in aluminum foil. Easy to work with, stays in place, and easy to get off when you're through.
One thing you might ask your paint store (automotive paints) is about prepping aluminum. Paint doesn't like to stick to it unless it's prepped.
They'll have an acid in a spray bottle that works. You leave it on a couple of minutes and hose it off. I don't know what acid it is but I've heard that it's just muriatic acid like you use in a swimming pool to adjust the ph. The acid etches the metal (you can't see it, it's too fine) so the paint will stick.
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Slideshow: The bar-and-shield logo shows up on far more than motorcycles, some of the company's most unexpected products have nothing to do with riding.
Slideshow: From the troubled AMF years to modern misfires, these bikes earned reputations for reliability issues, questionable engineering, or disappointing performance.
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Slideshow: The Swiss custom shop has taken a Harley Softail and stretched it into something so long and low that it looks closer to a rolling sculpture than a conventional motorcycle.
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Slideshow: A standard cruiser becomes an intricate metal canvas in the hands of a Swiss custom house known for pushing Harley-Davidson platforms far beyond their factory brief.
Slideshow: Harley-Davidson's challenges aren't abstract; they show up in dropping shipments, shrinking dealer traffic, and strategic decisions that aren't yet translating into growth.