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Help! Weird 2-Toned Finish on Aluminum

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  • Help! Weird 2-Toned Finish on Aluminum

    Here's the deal.....
    I'm getting this strange 2-toned finish on aluminum.
    It starts to appear somewhere between 320 to 600, during both wet sanding or steel wool,
    before I move to the buffing wheels.
    see picture
    It stays like that all the way through the three buffing wheels.

    What is this?
    What's causing it?
    What can I do to correct it, and/or stop it from occurring?

    Thanks!

    Mike


  • #2
    that is the layers in the metal it is a bad casting you may be able to blend them in some more

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    • #3
      I think the piece is made from round stock, approx. 7/16 inch diam. Is that still cast aluminum?

      In any case, any tips on blending? Should I level sand until I remove the top layer?

      Thanks again,

      Mike

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