The rubber undercoating is horrible. All it does after a few years is crack and hold water against the metal. Their is a wax undercoating that works much better, I know people who actually strip the rubber stuff and replace it with the spray on wax stuff. I forget the name, waxall maybe???

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2016 Corvette Stingray 2LT
1969 280SE
2023 Ram 1500
2007 Tiara 3200