When you use POR15, do you use any of the metal prep or anything else before applying it? I know you are a fan of Fluid Film, here in NE Ohio, where the roads are paved in salt brine for 6 months of the year, I have found that Woolwax is far superior for adhering to the undercarriage. I know that doesn't apply to you, but for anyone living in the rest belt, i highly recommend it! Made by the same manufacturer, it's just a lot thicker. Downside is you'll end up with it on you whenever you do anything underneath. At least it smells better than FF, lol. And THANKS for sharing so much knowledge! Mr. Patina GOAT.