Those are the kinds of tricks that start somewhere. I agree with what works. The first season I used Penetrol was a real nail biter, but during the season inspections everything looked fine. I've been doing it ever since with bottomkote type paints. Don't think I would try it Micron paint though. Painted bottom 2 weeks ago when it was 60 degrees. Now some zincs and new impellors and I should be ready to go.