Acrylic urethane, need info

Discussion in 'Luthier's Corner' started by MRJ, Aug 14, 2012.

  1. MRJ

    MRJ MLP Vendor

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    I'm considering using acrylic urethane for my own designs, and basically anything that doesn't involve vintage accuracy. I've used it plenty of time on cars, and I have used it on guitars years ago, but I wasn't happy with the results. But what is the best method for a transparent finish with grain filler? Would you build up the coats with Urethane? Or is there a clear sealer that works under Urethane? I know it's thicker than nitro, but I don't want to run into lifting or peeling issues from building up to much clear. Also what's the typical recoat time? Are Acrylic Urethane's basically the same as they were 6 to 10 years ago?
     
  2. Freddy G

    Freddy G V.I.P. Member

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    I like automotive 2k urethane. Just pore fill as you normally would first. Because the urethane has a lot higher solids content than nitro you don't have to shoot as many coats.
    When I shoot 2k I keep the build as thin as a nitro finish for least detriment to resonance.
    I have never had peeling or lifting issues.
    Also, the schedule is so fast. I polish out the guitar the next day after the last coat! If you wait too long the stuff gets so damn hard it's difficult to polish your final wet sand scratches out.
     
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  3. MRJ

    MRJ MLP Vendor

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    That's what I wanted to hear. How would you do a TV finish? White base coat followed by yellow, grain fill and clear like nitro? Ham many coats do you usually end up using with 2k?
     
  4. j.six

    j.six Senior Member

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    I'm also a fan of the 2k urethanes. To answer your question about shooting a trans finish, I like to mix the Trans Tint products in PPG's untinted base coat; It's called DBC500. I like using Z-Poxy, but if you were to use a waterbased pore filler, go along as Freddy mentioned, but use the DBC500 + your trans tint as color, and clear it 20 minutes later.

    I've had the best luck with shooting 3 coats of clear in a day, level sand with 600 on the next day and then shoot 2-3 more coats. Wetsand and buff it out the next day. It's definitely a time sensitive medium, though.

    Sully
     
  5. Freddy G

    Freddy G V.I.P. Member

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    yes.

    Depends on what size spray pattern...but using the same guns I would say less than half the coats of nitro.
     
  6. MRJ

    MRJ MLP Vendor

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    Thanks Sully, I appreciate the info! I'm going to be trying some Z-poxy soon. Does it look good with just a clear finish sprayed over it?


    Gotcha. I'm really looking forward to using Urethane again!
     
  7. shorty85

    shorty85 Senior Member

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    Freddy, would you mind sharing where I could find this 2K stuff in Canada. Is it one of those things you could find at a local hardware store like CanadianTire?

    Also, is it a one product deal, or is it best to use one of their products for colour coat (such as DBC500) and another for clear?

    I'd like to give the stuff a shot, but know next to nothing about it.

    Thanks,
    Shorty.
     
  8. j.six

    j.six Senior Member

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    Happy to help. I think it looks fine just under the clear; the only tint on this is around the edge (and the amber tint that ZP adds):

    [​IMG]

    Sully
     
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  9. Freddy G

    Freddy G V.I.P. Member

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    Not Canadian Tire. Look up autobody supply shops in the yellow pages. I have used base coats and clears of different brands so long as they are both automotive basecoat/clearcoat systems. You can also add dyes like trans-tint to the clear.
     
  10. MRJ

    MRJ MLP Vendor

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    NICE!:applause:
     
  11. j.six

    j.six Senior Member

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    thanks! Truth be told, I'm not crazy about painting.
     
  12. MRJ

    MRJ MLP Vendor

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    Painting I don't mind. But I despise wet sanding!
     
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  13. j.six

    j.six Senior Member

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    Tell it, brother!

    One of the most valuable lessons I've learned when it comes to painting guitars is paying someone else to do it. :)

    Sully
     
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  14. MRJ

    MRJ MLP Vendor

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    Yeah, I dream of the day when I can hire someone to do the finish work for me!:D
     
  15. slapshot

    slapshot Senior Member

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    paintings the best part to me.
    don't mind acrylic lacquer either now & then too
     
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