I have used “NU Finish” once a year polish in the past on our very first class C RV. It’s a watery polish in a pour out bottle. It was not to bad to apply, but as with any other polish or paste don’t get it on anything that’s rubber or black! My RV was covered when not in use and we used it every 2 months on average. I have to say, under these conditions it did last a full year.
I’ve used all the spray-on products when I had my classic car. I’d use Maguires paste every couple of months, and just before a show I would use the spray-on turtle wax. I found the spray-on turtle wax to be the best. Just don’t think it’s strong enough to last like a paste., Just my opinion. For chrome I have used this polish from King of Chrome Truck accessories, it was called “Ball Buster” (it had 2 balls inside the bottle that you shook to mix), I know it sounds funny but this stuff was amazing!
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