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Need some help a problem

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  • Member since
    August 2004
  • From: Forest Hill, Maryland
Need some help a problem
Posted by cwalker3 on Friday, June 24, 2022 12:58 PM

The pic below shows my problem. I'm using Scale Colors acrylic paint over top of a primer. I used the paint with no thinner. Room temp and humidity are 64 degrees and 70%, respectively. Airbrushing at 23-25 psi. Any help would be greatly appreciated.

Cary

 

  • Member since
    October 2019
  • From: New Braunfels, Texas
Posted by Tanker-Builder on Friday, June 24, 2022 2:09 PM

Oh Boy!

      You have fallen into a hole I wouldn't wish on anyone. When You Primed how long was it before you put the topcoat on? The reason I ask is this. When I have primed with Rustoleum Dove grey primer nothing bad happened. BUT, if I painted the topcoat to soon(Within say six hours) this is what happened. I believe the primer hadn't completely gassed out where the tight spots were.Those would've been Micromillimeters thicker than the open flat spaces.

      How close to completion are you? Are you so close that there's too much stuff in the way? Because, you either have to wait and try mist coats later or strip and start over! Based on the photo, I would say that Mist coats later is what you're going to have to do.

  • Member since
    August 2004
  • From: Forest Hill, Maryland
Posted by cwalker3 on Friday, June 24, 2022 2:40 PM

Thanks T.B. I waited 24 hours after priming before the top coat. I'll try a couple of light coats and see how it looks.

 

Cary

 

  • Member since
    August 2005
  • From: Mansfield, TX
Posted by EdGrune on Friday, June 24, 2022 5:00 PM

Your problem is two-fold,  too thin and too high a pressure.  Ideally airbrush paint should dry on contact.   You puddled the paint on.  Don't believe this to be a primer outgassing problem

23 to 25 PSI is too high.  You probably need to be in the 12 to 15 range.

Scale Colors, while they include a mixing ball in the bottle, really need to be mixed well. Spend the time to do it well, shaking for a few moments often isn't enough  I have a vortex mixer and I really need to spend a good while getting Scale Colors to mix, pigments separate to the bottom.

 

  • Member since
    August 2004
  • From: Forest Hill, Maryland
Posted by cwalker3 on Friday, June 24, 2022 9:00 PM

Thanks, I'll try those changes too.

Cary

 

  • Member since
    November 2018
Posted by oldermodelguy on Saturday, June 25, 2022 10:06 AM

Hard to say difinitvely from photos but It looks to me as though the paint just wasn't fully mixed. The air pressure depends on paint viscosity, gravity or siphon feed airbrush, distance of the passes and speed of the passes. So a blanket statement of your pressure being too high may or may not be so. I often shoot acrylics at 25 psi with no issues. But you can find that out simply by a little test shooting before applying the paint to your model.

  • Member since
    March 2022
  • From: Twin cities, MN
Posted by missileman2000 on Sunday, June 26, 2022 2:03 PM

It looks like the paint is not wetting the primer.  It may be an incompatibility between primer and paint.

 

 

  • Member since
    August 2004
  • From: Forest Hill, Maryland
Posted by cwalker3 on Friday, July 1, 2022 10:31 AM

I'm not positive but it looks like the humidity might have been the issue. It was running at 70% r.h. I placed a dehumidifier in the room and got it down to 54%. I've painted 3 or 4 times since and no problems.

Cary

 

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