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Paint Cracking Problem

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  • Member since
    August 2005
  • From: Sydney, Australia
Posted by Phil_H on Tuesday, January 27, 2009 8:50 PM

You're talking about cracking with the appearance of a dry lake bed/crocodile skin? 

There can be a number of reasons for this happening.

  • surface contaminants preventing your primer coat from adhering properly - shrinkage on application of your top coat pulls primer away from surface.
  • insufficuent drying time for your primer coat before top coating - shrinkage over a "soft" undercoat cauese cracking
  • too thick a top coat, causing uneven drying between the top and bottom layers of paint.
  • forced drying causing the top layers of paint to dry faster than the lower layers
  • ambient temperature too hot/cold causing uneven drying.

I'd sggest spraying in very light mist coats and allowing to dry thoroughly before recoating.

  • Member since
    July 2006
  • From: Middle Tennessee
Paint Cracking Problem
Posted by Dick McC2 on Tuesday, January 27, 2009 6:10 AM

I am in the process of building up a F-86F Sabre and plan on putting down various shades of Alclad II metallic paints on it. I first airbrushed a coat of Model Master 36270 gray as a primer coat, using Testors airbrush thinner. I let that dry for 24 hrs, and then applied a coat of Model Master Gloss Black. I let that dry for 24 hrs and yesterday got ready to apply a second coat when I noticed a couple places where the paint has cracked, small cracks and wrinkles to be sure but would definitely be noticeable should I apply Alclad without sanding. I haven't run into this problem before, but am guessing that I thinned the Gloss Black too much. Anyone have any ideas? I plan on letting the Gloss Black thoroughly dry, probably about a week, and then sand out the cracks and wrinkles with 2400 to 12000 sanding pads before attempting to put down another coat of Gloss Black.

Thanks in advance,

Dick McC

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