A few years ago I started to put on Poli Glo. Did one side things came up and never got to the other side. I left the Poli Glo in my shed and I'm sure it froze over the winter and didn't know if it would be any good. I purchased the Red Max Pro from Lowes to do the other side. You can not see a differance between either side. I would not use RMP or PG on a unit that can still be shined with wax. Mine is 20 years old and has a chalky finish to it. With RMP it shines real nice. Also mine is a cream color so not sure about any yellowing.