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Join Date: Jun 2011
Location: West Vancouver B.C.
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Re: Painting Cast Aluminum Binnacle Components
The only way I have ever found to keep paint on aluminium is to prime it with zinc chromate after thoroughly cleaning it first. Sandblasting is best but I've had good luck with sanding and wire wheels.
It's critical to get the zinc chromate on immediately after prepping the surface and wiping with solvent - aluminium starts oxidizing the minute you stop sanding.
I've had powder coating fail in one big piece - corroded under it and it came off like a mould of the piece.
Zinc chromate is what all the aircraft manufacturers use - it's the chartreuse colored coating you'll see on internal parts.
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