Home Oil Change and a bunch of other random questions

[Chamberpains]

Loo, that video is of rubberized undercoating. That stuff is crap. You see how easy he jabs his screwdriver through it. Its not a great coating. It gets moisture behind it because it's not a good sealant and people paint it over really rusted crap. All my experiences with it ended in horrible outcomes. Everything was better off being left bare to dry.

Like Rawze said, scrape the rust and flaky paint off. Do a little prep and drying. Corroseal and por15. I haven't had a problem yet with por15 except it doesn't like heavy duty degreaser. My 2nd coat pealed when I used it. 1st coat stayed intact.

As far as JimT pressurizing the coolant system while the pan is off. Its just good to know if you have the starts of a problem or a problem you didn't know you had. The pan is off, why not do it?