I did this years ago on a flat bottom boat, it really needs a special type of primer, I cant remember what its called, I know BIG HELP!, but itll stick either way, but last for a LOT longer with the proper primer.
go down to the local A/C shop and get this stuff that is
used to clean condinsers, I don't rember what it is called
but it's pink and is hydrofloric acid. The shop I use to work
at used this stuff to clean aluminum before we welded it.
then use and etching or epoxy primer.Guarenteed not to
HAWG WILD I USE TO BE SCHIZOPHRENIC, BUT NOW WE ARE FINE /wwwthreads_images/icons/crazy.gif
The acid etch is called Alodyne. You should be able to buy some at an aircraft supply store. If the part is small, dip it until it is a light golden color. If it is larger, take paper towels and soak them with the alodyne on the part until same color. Rinse part in water. Dry completely. Next use a zinc chromate primer or a substitute. Dry completely. Then top coat with a compatable paint, usually any type will be fine. The Alodyne step could be omitted if you scuff up the aluminum with scotch-brite, but you have to get every nook and cranny then use a solvent to remove any body oil. The alodyne is the best.
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