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I've used Por-15 alot. Normally all I do brush the surface to remove the loose rust, and then clean the surface with a power washer. I then paint, not marine clean, no other cleaner. Never had any bubbles that caused holes on the Por-15 paint. The surface isn't perfectly smooth, and there are color changes in the paint. When I have used Por-15 on an area I wanted to look real nice (not a frame) I always apply 3 coats, sand between then with 150 grit paper, and on the last one wet sand using 1200-1500 grit. Then paint with a nice black or gray or what ever color you want.
HTH
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