My 06 hado paint bubbles. I ground them off to see what was going on. Pin holes..
Ended up stripping off the paint about 4'' up, all the pin holes punched in slightly, and the voids filled with liquid metal. Acid etched, than covered it with silver POR-15. The silver has a metal filler in it. I've found its more durable.
Top coated with blue paint, than covered with Power Wagon flares.