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Hot Rods Acrylic or Urethane Enamel over oil based primer

Discussion in 'The Hokey Ass Message Board' started by 40FORDPU, Apr 17, 2020.

  1. 40FORDPU
    Joined: Mar 15, 2009
    Posts: 2,803

    40FORDPU
    Member
    from Yelm, Wa
    1. Northwest HAMBers

    Anyone have any experience using an oil based primer with acrylic or urethane enamel top coat?
    Why? I use TCP Global and have always used their primer mated with their top coat, I only paint acrylic enamel or urethane enamel.
    Yesterday I went to my paint storage (old refridgerator) to use my next gallon of never opened primer, only to find that half of it had solidified..sucks.
    So I got to thinking about the conveinience of my local Tractor Supply, not to mention the low cost.
     
  2. anthony myrick
    Joined: Sep 4, 2009
    Posts: 5,792

    anthony myrick
    Member

    shouldn’t be an issue if the oil based is completely dried.
    Usually it it sands, it can be painted.
     
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  3. Phil1934
    Joined: Jun 24, 2001
    Posts: 2,703

    Phil1934
    Member

    I don't think Tractor Supply has any oil based. Went to water based a few years ago.
     
  4. 40FORDPU
    Joined: Mar 15, 2009
    Posts: 2,803

    40FORDPU
    Member
    from Yelm, Wa
    1. Northwest HAMBers

    Thanks, that is the same logic I was using.
     
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  5. 40FORDPU
    Joined: Mar 15, 2009
    Posts: 2,803

    40FORDPU
    Member
    from Yelm, Wa
    1. Northwest HAMBers

    I found it listed on their web site (albeit, maybe not updated).
    Naturally the next question would be, okay to paint my acrylic over water based primer?
     
  6. 19Fordy
    Joined: May 17, 2003
    Posts: 6,815

    19Fordy
    Member

    Don't take a chance of using products that may not be compatible. Flaws may not show up until a few years pass.
    Spend the dough and use the "system" recommended by the paint manufacturer.
     
  7. 40FORDPU
    Joined: Mar 15, 2009
    Posts: 2,803

    40FORDPU
    Member
    from Yelm, Wa
    1. Northwest HAMBers

    I agree..and always have to this point.
    But, when I'm ready to use it and half of it has solidified, it made me think of a more logical, practical, and efficient method.
     
  8. anthony myrick
    Joined: Sep 4, 2009
    Posts: 5,792

    anthony myrick
    Member

    For me it depends on what I’m painting.
    For a customer it’s a no or something that I need to look perfect
    If it’s a part for a beater car or equipment I wouldn’t hesitate.
    That being said, oil based primers usually seem to lay on bare metal instead of bonding to it like automotive primers do.
    What are you painting.
     
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  9. oldiron 440
    Joined: Dec 12, 2018
    Posts: 1,507

    oldiron 440
    Member

    Years ago there was a alkyd enamel primer sealer that we used under Centari acrylic enamels.
    All Dupont products that worked well together.
     
    Last edited: Apr 17, 2020
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  10. Flat Six Fix
    Joined: Feb 6, 2010
    Posts: 1,043

    Flat Six Fix
    Member

    Generally all synthetic /alkyd enamels will be fine, once fully cured 2 to 3 weeks is my guideline.
    Oil based primers can be cut with urethane grade reducer too or xylene and acetone.
    Many I know will use rusty metal primer, followed by fillers and urethane primer surfacers on top.
    When in doubt test a small area, if primer ain't fully cured or solvents too aggressive can and will bubble.
    Good luck
     
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  11. Lloyd's paint & glass
    Joined: Nov 16, 2019
    Posts: 2,267

    Lloyd's paint & glass
    ALLIANCE MEMBER

    Did your primer solidify or separate the solids? Have the paint store throw it on the shaker
     
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  12. Ulu
    Joined: Feb 26, 2014
    Posts: 1,754

    Ulu
    Member
    from CenCal

    I shot my fiberglass boat with Rustoleum gray primer, and turquoise catalyzed Starthane polyurethane in 1999.
    It's been touched up a lot from scratches, but still looks good, and nothing blistered or fell off.
    I do keep it covered when not in use. It's not particularly clean in this 2018 photo
    6937.jpeg
     
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  13. 40FORDPU
    Joined: Mar 15, 2009
    Posts: 2,803

    40FORDPU
    Member
    from Yelm, Wa
    1. Northwest HAMBers

    Separated for sure, but seems much more than just that..I'd be surprised if any amount of shaking would mix it back to its original composition.
    I have put a paint stick in the can, and after prying to get thru to the bottom of the can, came up with a gooey mass at its best, and solid at its worst.
    I can see this happening again in the future, as I only paint a car every year or so, which is why I'm considering alternatives, as I know the meaning of insanity.
    I appreciate the response.
     
  14. 40FORDPU
    Joined: Mar 15, 2009
    Posts: 2,803

    40FORDPU
    Member
    from Yelm, Wa
    1. Northwest HAMBers

    I just got back from my local Tractor Supply (Yes, I also needed groceries at the Safeway) I bought their gallon of oil based gray primer ($19.95) so will be starting my in house testing on some metal I have.
    I'll post results in a couple of weeks, and let you know the results.
    Thanks for the replies.
     
  15. BamaMav
    Joined: Jun 19, 2011
    Posts: 4,161

    BamaMav
    Member
    from Berry, AL

    I sprayed NAPA Martin Senour enamel over Rustoleum red oxide primer on a VW Bug one time. Paint looked great for about 6 months, then it came off in sheets, leaving the red oxide primer. It didn't adhere to the red oxide worth a damn. I just left it in the red oxide primer after that.
     
  16. derbydad276
    Joined: May 29, 2011
    Posts: 1,310

    derbydad276
    Member

    painted a f100 with rusteoleum 8 years ago still looks good shot it over 2 part primer
     
  17. I used to use Napa Martin Senour paints too, long ago.
    I started having probs with shrinkage, weathering too soon etc.
    I switched to other more expensive brands and discovered why Napa paints were so competitively priced.
    I believe they skimp on important additives that prevent shrinkage and early aging. I went to a higher quality paint and all was well again.


    WHY BE ORDINARY ?
     

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