The old ONR had an unstable blue dye. Over time it would turn a pretty ugly brown, but it still worked fine. They then came out with a new stable blue dye, but there really was no formula change, so there was only one version.
Had to strip my 2006 Mazda MX5 (Miata) paint down due to an unfortunate experiment gone wrong. I tried to apply Collinite 915 over Pinnacle Souveran and it streaked and clouded like a mother. Since this vehicle is a daily driver and exposed to the elements 24/7 I decided to try a sealant as an...
+1 on the 901 car wash.
Consider substituting Duragloss Marine & RV Detail Spray #521 for the #921. It is supposed to be a stronger product with more cleaning agents and more protection. I have used up a bottle and it is great.