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Thread: polyeurathane use after lacquer or shellac

  1. #1
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    polyeurathane use after lacquer or shellac

    ok have a possible project where the customer wants poly for finish.. i normally use shellac and or lacquer.. so what do i need to know before i fill my spray gun with this stuff? or should i just hand apply? they want a gloss finish.
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  2. #2
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    Larry, Poly is going to dry much slower than lacquer leaving it open to collecting any airborne dust and such. Also, poly does not "build" like lacquer on additional coats. Yes, I would spray but very light coats.

    Doug

  3. #3
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    If you're asking about spraying poly over shellac, I've done it - with disastrous results! Even though I'd scuff-sanded the shellac, the poly didn't bond to it, and just peeled away.

    As for just using straight poly (no shellac under it), what Douglas said is correct. I'd also sand lightly between coats - and you'll likely only get one coat per day.

    BTW, the waterborne polys are pretty good, too, but I still prefer the solvent stuff when I've gotta use poly.
    Jim D.
    Adapt, Improvise, Overcome!

  4. #4
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    Doesn't poly need to have subsequent coats applied within a limited time or be rubbed down with 0000 steel wool or the like to give it tooth for the next coat to stick properly?
    "Forget the flat stuff slap something on the spinny thing and lets go, we're burning daylight" Bart Leetch
    "If it ain't round you may be a knuckle dragger""Turners drag their nuckles too, they just do it at a higher RPM"Bart

  5. #5
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    unfortunately this client has specs poly, i didnt even attempt to talk to him on lacquer.. should have.. is there a argument for ploy over lacquer? in my eyes there isnt.
    If in Doubt, Build it Stout!
    One hand washes the other!
    Don't put off today till tomorrow!

  6. #6
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    Quote Originally Posted by Jim DeLaney View Post
    If you're asking about spraying poly over shellac, I've done it - with disastrous results!
    ...
    BTW, the waterborne polys are pretty good, too, but I still prefer the solvent stuff when I've gotta use poly.
    Really?

    I put Flecto Varathane (which is a WB poly) over zinsser dewaxed shellac several times. Worked fine.
    I've sprayed it only once -- I was not thrilled with how slowly it built up, but it worked. Usually I make smaller projects and then I brush it on. 3-4 coats and it's hard and glossy.
    There's usually more than one way to do it...
    www.wordsnwood.com ........ facebook.com/wordsnwood

  7. #7
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    Larry fetch your self some Ben Moor's water base and shoot it on. You can shoot 2 or 3 light coats than let it stand over night hit it with some 220 and shoot a finish coat on. Last time I used a cheap gun from HD I'm off to see how it goes through my new spray fine but I'm thinking the CV tip in the spray fine is to big for the polly. I'll let ya know in a few hours.
    It could be worse You could be on fire.
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  8. #8
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    Fibbed to ya on the brand. I'm shooting ZAR but the shop is just a bit to cold for fast drying so we are waiting for the second coat. Guessing about an hour.
    It could be worse You could be on fire.
    Stupid hurts.

  9. #9
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    Ok second and third done. Now it's wait and see if I need to knock it down tomorrow and shoot it one last time.
    It could be worse You could be on fire.
    Stupid hurts.

  10. #10
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    keep me uniformed capt. we needs ta no
    If in Doubt, Build it Stout!
    One hand washes the other!
    Don't put off today till tomorrow!

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