Aluminium prep and undercoat advise?

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alternativeroute

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I have this Technics chassis that I want to respray. The old paintwork was corroded and peeling. I have stripped it and did a coat of paint stripper. I have also wet sanded it to smooth the surface.

I am left with this:


Technics chassis by alternativeroute, on Flickr

The black parts are where the aluminium was corroded. You can also see a few spots of the original primer. The centre bit is the original paintwork...

Questions:
  • Before I add a top-coat. What sort of basecoat would you suggest?
  • Are the black corroded bits going to be a problem? They are smooth to the touch now but obviously discoloured....
 
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