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Thread: Prep frame for paint media blasting what type ?

  1. #1
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    Default Prep frame for paint media blasting what type ?

    Still searching for that 45.....

  2. #2

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    I use 30/65 silica sand in a pressure pot sandblaster with about 100 PSI. That grade of sand provides a good surface for the primer. Courser sand will require more primer to attain a smooth finish. Probably are several other methods for doing this job but this works for me.
    Dave

  3. #3
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    Glass bead too abrasive?
    Still searching for that 45.....

  4. #4
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    Quote Originally Posted by Digging4treasure View Post
    Glass bead too abrasive?
    What I was told, Digging4treasure,

    Beads hammer a surface clean, a bit smooth for paints to grab onto.
    Sharp media etches a "mill profile", some more destructive than others.

    I hate paint.

    ....Cotten
    AMCA #776
    Dumpster Diver's Motto: Seek,... and Ye Shall Find!

  5. #5
    Join Date
    Nov 2018
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    Reno NV
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    Abrasive blasting with silica sand has been banned in some countries due to the possible exposure to the dust which can lead to Silicosis. This exposure is similar to asbestos exposure. Both can lead to lung disease.
    Another reason it is not used in most industries is that it was found out that the silica sand was impregnating the substrate with silica, causing problems with paint adherence.
    There are a number of alternative abrasives these days.
    If you are using a pressure pot, Garnet is a direct replacement for silica sand. It is a bit more expensive, but it is safer to use, and can be reused a couple of times, depending on the grit you start with.
    Cheers,
    Mick

  6. #6
    Join Date
    May 2009
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    144

    Default

    I use coal slag. It works fine.

  7. #7
    Join Date
    Oct 2011
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    I realize the question is about blasting a frame,but I like paint remover,wire brush and a phosphoric acid rinse.
    I have glass beaded plenty of parts over the years but no longer have access and a frame never fit in the cabinet,plus I like the results.
    Tom

  8. #8
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    Sep 2005
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    Sarasota, Florida
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    I'm with Tom on frame preparation if the frame is in good shape. If the frame is going to need straightening, and welding then I believe an industrial sandblasting will also have the important benefit of stress relieving. I just finished painting the frame for my '66 Honda 450 and used all the techniques Tom suggested.
    Eric Smith
    AMCA #886

  9. #9
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    Quote Originally Posted by exeric View Post
    I'm with Tom on frame preparation if the frame is in good shape. If the frame is going to need straightening, and welding then I believe an industrial sandblasting will also have the important benefit of stress relieving. I just finished painting the frame for my '66 Honda 450 and used all the techniques Tom suggested.
    "In good shape"?

    That's relative, Eric!

    Preventing further corrosion requires thorough removal as well as encapsulation.

    Even if its straight.
    (Nobody should mess with OP of course.)

    Frankly, for safety's sake on warhorses, frames should be blasted to 'gray metal' for inspection.
    That could be a thread in itself.

    ....Cotten
    AMCA #776
    Dumpster Diver's Motto: Seek,... and Ye Shall Find!

  10. #10
    Join Date
    Oct 2011
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    486

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    Back to blasting.
    The more paint you remove with a stripper the finer media can be used,with less effort and expense and good metal removal.And round tubes sand so easy by hand.
    For safety sake dont hang the frame over your head with string.
    Tom

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