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painting aluminum extrusion

Discussion in 'General Signmaking Topics' started by gabagoo, Jul 20, 2010.

  1. gabagoo

    gabagoo Major Contributor

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    I need to supply a customer with a forst green aluminum extrusion. Not having spray facilities what way can I spray the frame without fear of failure with paint peeling off? Spray bombs? One shot?
     
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  2. SignosaurusRex

    SignosaurusRex Major Contributor

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    Zinc Oxide primer in a spray can first, then spray with whatever. Just make sure the aluminum is cleaned well.
     
  3. J Hill Designs

    J Hill Designs Major Contributor

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    yep - cleaned, scuffed, then degreased...and possible acid etched...
     
  4. sagesign

    sagesign Member

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    I've had good luck with spray bombs. You need to use a self etching primer bomb first.
     
  5. Gino

    Gino Premium Subscriber

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    Is this a new can ?? If you're ordering it, they should be able to paint it for you.

    If its a used can and you can't spray it properly, than I'd scuff up the area with 600 grit and roller coat the can in two coats.

    Seriously, rattle cans are not for this kind of application.
     
  6. Marlene

    Marlene Major Contributor

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    clean, scuffed and aluminum oxide primer. it's better to paint two thin layers than one thick one. it helps keep it from peeling.
     
  7. artbot

    artbot Very Active Member

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    remember to paint immediately (and i mean immediately) after prep. the aluminum will build an oxide layer that will multiply after painting. paint does not "peel" off of aluminum. it is pushed off by oxidation. just because it looks "silver" doesn't mean that it is clean. if it's going to endure harsh conditions, i'd just drop them off at a powder coater.
     
  8. J Hill Designs

    J Hill Designs Major Contributor

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    good idea on the p/c!
     
  9. Craig Sjoquist

    Craig Sjoquist Major Contributor

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    Auto paint supplier has a Aluminum cleaner before priming. a must do
     
  10. gabagoo

    gabagoo Major Contributor

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    OK guys,,, great advice. I will search for the spray primer...lowes? HD? or is this a specialty spray? I am using a new mill finish.
    This particular supplier does not spray the frames. It is a small 4 x 6 sign.
     
  11. petrosgraphics

    petrosgraphics Member

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    mathews makes a primer for raw aluminum. it works great.. all you have to do is wipe the alum. with lac thinner or denatured alcohol, get the oils off, and brush this on..
    it never really dries, it gets to a point where it is almost dry, like gold size, at that point
    you can paint it with any enamel, brush or spray, never had a problem with the paint not
    sticking to it... it goes on clear, stays clear.... mathews paint bond
     
  12. John L

    John L Very Active Member

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    Many NAPA's carry etching primer in both rattle can and quart. Otherwise lookup a local automotive paint supplier.
     
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