Maybe I can be of some help regarding those unwanted air bubbles. You may want to employ the "Tipping Process" immediately after the painted surface it is rolled. Tipping is taking the widest brush you can use effectively (i.e. 4" on wide flat surfaces, 1-2" on those small and sharply curves areas) and making straight, long uninterrupted passes from one end to the other of the item being painted. However, one only uses the tip of the brush (approximately 1/4") ; thus, the term tipping. This process removes ALL of those dreaded air bubbles in one fell swoop. I helped build a 12' wooden boat that was fiberglassed over. We used a 2 part epoxy PPG primer ($110 a quart), thinned 50/50, and rolled on with chemical resistent foam rollers. Once complete, we lightly wet sanded using 600 grit and applied a second coat of primer. The topcoat was West Marine's very brillant red (forgot the name), which also was rolled and a total of 3 coats applied. Each and every coat was tipped and wet sanded (moving up the grit ladder) with the final coat wet sanded with 1200 grit. Sorry for the lengthy reply. Good luck, Nancy