painting problem

oldrk Mar 12, 2010

  1. oldrk

    oldrk TrainBoard Supporter

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    I have had problems with using gloss coat over painted models. I was using spray paint to paint sone plastic F units. I waited a few days later and them gave them a coat of gloss coat. When it dried the paint crinkled up. Any ideas?
     
  2. Flash Blackman

    Flash Blackman TrainBoard Member

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    I had the same thing happen to me today as far as the "crinkle" on the paint. I sprayed enamel directly on the (styrene?) plastic and got a crinkle.

    Stripped it and used primer first. Then re-sprayed with acrylic. Came out fine. I think the primer was the key to protect the plastic.

    I don't know the answer but I think you are in for stripping and starting over.

    In my case, the automotive guys used to call it "orange peel."
     
  3. Mike VE2TRV

    Mike VE2TRV TrainBoard Member

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    I've had the same "orange peel" effect with paint-over-paint, but never paint-over-primer, or gloss-over-paint, or dullcote-over-paint. And still, it doesn't happen every time.

    It may be a difference in paint compositions, one component in one paint reacting with the other paint, or the gloss. Different solvents in different paints? Maybe the coat being covered with gloss is slightly thicker than intended and not quite dry through and through, and reacts with the solvents in the gloss?

    :mwacko:
     
  4. Jack28

    Jack28 TrainBoard Member

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    incompatible paint types
     
  5. MANDONY

    MANDONY TrainBoard Member

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    I agree with Jack28, stay with one maker of paint and assure that the paints are compatible.

    Also to consider:

    Humidity. Make sure that there is low moisture in the air when you coat.

    Temperature. Make sure the air temperature is not too hot or cold.

    Adequate dry time between coats: This may be affected by humidity and temperature too.

    If self mixing, make sure you have the proper solvents and reducers.

    Keep coats thin; re-coat to build up depth.

    When painting for "glossy", use matte or flat undercoats.
     
  6. Mike Sheridan

    Mike Sheridan TrainBoard Member

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    Yep. All paints are pigments carried in solvents. Some paint's solvents will act like paint stripper on other paints or even plastics.

    Some automotive spray cans are good at this if applied too heavily, but can work OK if applied in light coats (as they should be) so they dry and the solvent is gone before it has time to get to work on the underlying paint/plastic.
     

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