Nu-Finish is a great product, but it is a polish not a wax and you would have to buff out the cap first. I have used it for years rig and vehicles, but you have to have a good finish as a start point.
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Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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