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Old 01-10-2006, 11:23 AM
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Cracking Paint issue.

I also belong to airbrush.com forum. Someone posted this issue and was looking for some possible answers. I know if anybody can explain it it's gonna be the guys here.
Here is the link:
http://www.airbrush.com/forums/tm.aspx?m=143341

A little of what the artist noticed about the car:

"I saw a show car with this over the weekend:

Can tell you what the owner was TOLD:
PGP
Car had been previously taken to metal and painted within past three years, painted blue. Then painted black. Took it in for a new paint job. This 2nd layer of black paint was scuffed and painted.
Car was taped off and painted as it sat. Only some trim was removed.

Can tell you what owner SAW:
Car looked fine for three weeks or so.
Temp was about 70 degrees throughout the entire time (Southern California)
Picture taken about 4 months later after cracks stopped traveling. (Taken indoors at show by me- red is neon lighting)
NO LIFTING that we can see.
No bubbles.
Some orangepeel. Cracks seem to occure where large sections of orngepeel are - but NOT exclusively.
No wrinkles - well, only one small one under the trunk latch.
Cracks started small, now are up to almost a foot long in some places and up to 1/2" wide.
Cracks are down to a black layer. And paint layer of crack itself is THICK. About 3 sheets of paper or so. Like your worst paint edge.
Cracks appear to start at a pressure or stress point. Some touch trim, but not all.


Owner took car back to shop for warranty repair - met about a dozen other unhappy customers and a closed shop."

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Old 01-10-2006, 12:09 PM
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Very simple and not that uncommon.

Pigment contraction:

Cause by either under-reducing one of the colors to get it to cover.
OR:
Loading of a color to get it to hid.

As a matter of fact if you dig in the paint the base that caused the problem will still be soft, (yes it will skim enough to wet-sand when the color was applied.)

Going by width and time it took it was the first color applied.
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Old 01-10-2006, 12:24 PM
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Elucidate please?

Barry,
How would a fellow not do this..My take is keep the coats thin with plenty of flash time between to get coverage and prevent this..

Your take please..

OMT
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I have tried most all of it and now do what is known to work..
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Old 01-10-2006, 12:45 PM
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One More Time,

Yes but just reducing normally with proper flash will solve the problem.

To create this problem was mass abuse of the basecoat, not a slight mistake.

Most common in Reds, Drk Greens, Drk Blues.
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Old 01-10-2006, 09:29 PM
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I seen a similar deal years ago when PPG's supercharger was being used to get clear to lock up fast when air temps were low and the outside winter air was well below freezing. The cars buffed and went out the door just fine but all later came back with huge cracking problems, I can't remember what clear was being used for sure but probably 2020. The rep said quit using the supercharger
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