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Customs 4to1 urethane hardener in acrylic enamel?

Discussion in 'The Hokey Ass Message Board' started by jimcaf, May 9, 2026.

  1. jimcaf
    Joined: Feb 12, 2008
    Posts: 138

    jimcaf
    Member
    from Kingman AZ

    I tried it out on a few small parts and a s**** test panel, seems almost twice as shiny and kicks off and is tack free much faster than the 8 to1, behaves just like urethane single stage. Anyone else tried this, quick note too before any one loses their mind reading this lol,the hardeners appear to have the same main ingredients
     
    42merc, alanp561 and Fitty Toomuch like this.
  2. RMR&C
    Joined: Dec 26, 2009
    Posts: 6,478

    RMR&C
    Member
    from NW Montana

    What brand? The hardener may well be the same, but is used in different ratios for a reason
     
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  3. jimcaf
    Joined: Feb 12, 2008
    Posts: 138

    jimcaf
    Member
    from Kingman AZ

    the hardener is Upol ,i been using there product line for some years now,the acrylic enamel is an off brand from ebay,here is what iv found off some product or sds sheets on hardeners
    upol Hexamethylene diisocyanate, 30 - 60 % by weight versus typical off the shelf acrylic enamel hardener Hexamethylene Diisocyanate 50-75% by weight so baseing it off that seem going 4to1 was pretty safe
     
    alanp561 likes this.
  4. K13
    Joined: May 29, 2006
    Posts: 10,012

    K13
    Member

    I hope you all realize that the hardener is the deadly aspect of modern paints and using it in enamel makes enamel just as dangerous as urethane paints and the same safety precautions need to be followed.
     
    alanp561, jimcaf and Sharpone like this.
  5. jimcaf
    Joined: Feb 12, 2008
    Posts: 138

    jimcaf
    Member
    from Kingman AZ

    I do suit up as i should and thanks for that
     
    alanp561 and K13 like this.
  6. Blue One
    Joined: Feb 6, 2010
    Posts: 11,578

    Blue One
    ALLIANCE MEMBER
    from Alberta

    Because the isocyanates are the most dangerous to your lungs suiting up should include adequate respiratory protection charcoal filters at the bare minimum, a supplied air face shield under positive pressure is best.
     
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  7. willys36
    Joined: May 6, 2006
    Posts: 3,460

    willys36
    Member

    I use a drip in model car enamel to harden it.
     
  8. jimcaf
    Joined: Feb 12, 2008
    Posts: 138

    jimcaf
    Member
    from Kingman AZ

    A Drip ? im not sure what you mean,or do you mean you just throw a little in by eye
     
  9. HSF
    Joined: Oct 25, 2014
    Posts: 269

    HSF
    Member
    from Lodi CA

    Just use urethane paint, hot rodding ain't cheap. As a painter, I do what the can says. I'm not a chemist.
     
    jimcaf likes this.
  10. willys36
    Joined: May 6, 2006
    Posts: 3,460

    willys36
    Member

    Yes. I'm referring to the brush paint in the little bottles. Pour out a bit of paint, add in a tiny bit of hardener, then paint. Cures like catalyzed urethane, doesn't stay gummy for a long time like the enamel usually does. Works in any enamel brush paint used for crafts and hobbies.
     
    jimcaf likes this.

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