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Problem with dullcoat

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  • Member since
    April 2024
Problem with dullcoat
Posted by dlb411 on Wednesday, April 17, 2024 12:14 AM

Build my first model in many years, the base color is a sky grey acrylic.   To give the model a flat finish, I first tried brush on Testors Dullcoat, it immediately started to disolve the paint.   I've now tried Krylon matte crystal clear spray, same effect.    What can work with no problems messing up the acrylic paint?

  • Member since
    March 2003
  • From: Western North Carolina
Posted by Tojo72 on Wednesday, April 17, 2024 2:50 PM

They are probably to hot for the acrylics,maybe try switching to an acrylic matte like Vallejo.I have also used Alclad.

If you don't have an airbrush,Vallejo I think is available in a spray can.

  • Member since
    April 2003
  • From: USA
Posted by keavdog on Wednesday, April 17, 2024 3:03 PM

I believe Testors Dullcote is a laquer.  I have had success airbrushing over future floor was (gloss coat, decals, dull cote).  But maybe brushing on is to heavy.  I found this matrix a helpful guide

 

Thanks,

John

  • Member since
    November 2018
Posted by oldermodelguy on Wednesday, April 17, 2024 3:06 PM

My reply would depend on what the acrylic was that you used. Some acrylics from say, Dollar Tree, basically nothing works with a brush over. As they are meant to be removeable paints. IE water washable, never mind solvents, even in spray. To know that, read the label.

  • Member since
    March 2003
  • From: Western North Carolina
Posted by Tojo72 on Wednesday, April 17, 2024 3:06 PM

I've put Alclad Matte which is a lacquer over acrylics lightly misted with no issues,but I don't think he has an AB

  • Member since
    April 2020
Posted by Eaglecash867 on Thursday, April 18, 2024 6:46 AM

Brushing on a lacquer-based paint like Testors Dullcote is going to have bad results, no matter what kind of paint is underneath it.  It is pretty much a universal solvent, and the brush is adding the element of mechanical stress to the equation.  That being said, a lacquer can also be successfully used, no matter what kind of paint is underneath it, as long as it is sprayed on lightly (not applied with a brush).  But, even a rattle can tends to put the paint on WAY too wet and heavy, and it will attack any paint that it is applied over if you're too close to the surface with the rattle can.  The same would apply to the Krylon spray that you tried.  Since you're going for a matte finish, you can easily back off the model while using the Krylon.  With a matte paint, it won't matter if it's practically dry before it hits the surface of the model, which tends to produce a more matte finish, which is exactly what you want.  My advice would be to try again with the Krylon spray, and increase the distance between the can nozzle and the surface you're spraying it on.  When it doesn't go on wet and heavy, it won't have enough time to damage the paint underneath it.

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  • Member since
    September 2006
  • From: Bethlehem PA
Posted by the Baron on Thursday, April 18, 2024 3:55 PM

I didn't know DullCote was available in a liquid form for hand-brushing.  I use the rattlecans.  I use it over water-based acrylics, like Vallejo Model Color, Andrea, Lifecolor, or craft store acrylics, with no problems.  I also use it over Tamiya's acrylics, and enamels, no problems.

Given that it is a lacquer, as was mentioned, it could be that the amount going down when applied by hand is concentrated enough to attack the color coats, compared to a coat sprayed.

The bigger the government, the smaller the citizen.

 

 

  • Member since
    May 2006
  • From: Chapin, South Carolina
Posted by Shipwreck on Thursday, April 18, 2024 5:00 PM

I have been using Testors dull coat rattle can over my acrylic for years and never had a problem!

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  • Member since
    November 2018
Posted by oldermodelguy on Friday, April 19, 2024 5:51 AM

Dullcoat used with an airbrush is a no brainer, just dust it on in a couple of light coats and you're done. But the brush floods it on then as mentioned above, if you use any force with the bristles, you're basically mechanically removing the base color coat.

Way back "in the day" I did brush dullcoat over decals applied to Floquil paints. I just floated the coat on and let it dry. Worked great. But that's not the same as dull coating an entire finish.

But as I mentioned in my other post, there is a class of acrylic paints that are made to be washed off. They aren't a permanent paint. I'm not saying the OP used it but when used, pretty much any liquid brushed over it will have it running right off.

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