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Technical Paint Prep Question

Discussion in 'The Hokey Ass Message Board' started by pila38, Aug 3, 2016.

  1. pila38
    Joined: Mar 25, 2009
    Posts: 763

    pila38
    Member

    Hey guys,
    Getting ready to paint the rear end housing in my truck. I put some cheap red oxide primer on it when I first welded everything up just to protect the metal while I moved to a new house. I'll be using Extreme Chassis Black as a color, but it needs epoxy primer as a base for proper adhesion. So, I'm using a wire wheel to remove the red oxy and bring it back down to bare metal. Question is...is the wire wheel enough to abrade the surface for the epoxy primer, or should I sand it with 80-180 grit before priming? Thanks in advance for the advice.
    Eric
     
  2. Mudgy
    Joined: Dec 4, 2010
    Posts: 231

    Mudgy
    Member

    maybe..... is it worth brushing on some POR 15 or similar? Instead of spraying it twice? tough stuff. Just a thought.
    Cheers, Mudgy
     
  3. Gearhead Graphics
    Joined: Oct 4, 2008
    Posts: 3,728

    Gearhead Graphics
    Member
    from Denver Co

    but POR doesn't like clean metal. I put it on clean metal on my frame and it peels off in sheets. Theres a way to make it stick... but I was in a hurry and didn't follow those instructions.
     
  4. bonzo-1
    Joined: Oct 13, 2010
    Posts: 335

    bonzo-1
    Member

    I should take all of 10 minutes to scrub it with 80 grit after your wire wheel. Why not do it?
     

  5. ^ Yep! Degrease the hell out of it too. Get it clean and sand it so the paint has something to stick to.
     
  6. Needs the clean metal etch prep to stick.
     
  7. pila38
    Joined: Mar 25, 2009
    Posts: 763

    pila38
    Member

    Thanks guys. I'll hit it with 80 and clean it real nice before the prime.
     
  8. I see you got the answer already too use 80grit, but i thought i would share that after using a wire wheel have you ever noticed that the metal looks a little glazed over?.
    Ive found that its now to smooth for primer to bond. Always abrade with sandpaper.:)
     
  9. seb fontana
    Joined: Sep 1, 2005
    Posts: 6,757

    seb fontana
    Member
    from ct

    I'd sand blast it...
     
  10. pila38
    Joined: Mar 25, 2009
    Posts: 763

    pila38
    Member

    A good idea, however, I don't have a cabinet and it would make too much mess with the blaster I have.
     
  11. henryj1951
    Joined: Sep 23, 2012
    Posts: 2,304

    henryj1951
    Member
    from USA

    paint STICKS with one , the other, or BOTH...
    a mechanical or chemical BOND...:cool:



    AS the above posters have ALREADY said.
     

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