There is another thread in here where users talk about using the MArine/RV polish #50 and are extremely happy with it. They never mentioned using it in conjunction with another product. Just on its on, and seem happy with it. I just picked some up and plan on tackling the 5th soon...wasn't thinking of using anything else. In the past I have used Nu Finish as well, and found it looks good at first but doesn't have the lasting effect. Times I have used the Nu Finish, it was a 2 day job, all by hand.
2011 GMC Sierra 2500HD
2014 Rockwood 8289WS, Diamond Pkg.