[Frizzle Fry]

Yes there are imperfections in the metal. The primer is there to seal the bare metal, and that's where the body work begins.

So far I've been happy with the SPI. Did a little panel scratch test vs Valspar and it seemed like more material was removed from the Valspar side. Granted it was a very unscientific test, I didn't see any drawbacks to the SPI. Long-term performance only time will tell...