Wax easy
I have a 5W Gel Coated 2006 that is on the road every summer for 4-5 months and is stored in the open during winters and some times covered with snow. I have minor not deep scratches from tree branch...
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I use zaino on my autos and will use it on the 5er this year for the first time. It's a polymer based polish and not wax based so you don't have near the issues with it. It's also easy to apply by hand and remove if you add the flash cure. It's basically rub it on and polish it off a few seconds later. Zaino isn't cheap but a little goes a long way. I can do my duramax using an ounce. What you'll find is that prep is everything in getting a good shine no matter what you use. I plan to claybar mine and start from the ground up. After that first application it gets much easier though and unlike wax it'll "stack" so your camper will get a higher gloss after each application. I've been using it for over 10 years on my 98 f-body that has 90xxx miles on it.
