I experienced something similar once and it was caused by wiping the part down with lacquer thinner prior to painting, I use acetone now and it hasn't happened since.

Last edited by sstock; 03/21/2014 2:06 AM.

1953 Chevrolet 3100
261 cu inch, sm420, 3.55 rear, torque tube still,omaha orange, still 6 volt, RPO green glass, side carrier spare, all done
In the DITY Gallery
Video of the 261 running

1964 GMC 1000
305 Big Block V6, sm420, the next cab off restoration