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Several of these critters just showed up on my doors
All the hours of filler...blocking ...and 2k primer and i find this when wet sanding 500
im heart broken....but i dont think base and clear is ever gona hide the cracks.
Tomorow its 80 grit DA back to metal and start again.
opps start again...grrr
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 Posted: Mon Jul 18, 2016 3:18 pm
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Posted: Mon Jul 18, 2016 7:16 pm
****! Any idea what caused it?
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Posted: Mon Jul 18, 2016 8:18 pm
Well i belive this would be caused by heat, and too much material. Spraying outside?
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Posted: Mon Jul 18, 2016 10:04 pm
Not enough flash time between coats of build primer.
1968 Coronet R/T
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Posted: Mon Jul 18, 2016 11:24 pm
That is filler cracking. Paint don't crack like that.
What kind of filler did you use ? Experienced Trained Certified
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Posted: Mon Jul 18, 2016 11:26 pm
After awhile metal starts to rust and to me that's what it looks like. Rust making the filler let go and crack. How long has the filler been on the door ?
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Posted: Tue Jul 19, 2016 4:02 pm
I disagree, 2k primer will crack like that.
NO FILLER on this tailgate:  I was in a hurry to play around with the Candy/Pear mix and just shot one coat after another. 1968 Coronet R/T
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Posted: Tue Jul 19, 2016 4:36 pm
Well I believe you. That is strange. Cheap primer ? I build my primers well over 15 mils in one priming session. One coat after another on my HDU sign foam and in all the years I been painting have never seen a 2k primer crack like that.
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Posted: Tue Jul 19, 2016 6:32 pm
It was a first for me as well but I am pretty certain it was from solvent being trapped and then excessive shrinking.
Just takes the extra time to be sure it flashes off before shooting another coat. With 2k primer that usually isn't very long and doing a complete you might get away with one after another. Reducer temp would play a big part as well. 1968 Coronet R/T
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Posted: Tue Jul 19, 2016 8:23 pm
Very true
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