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working on my two front fenders, both are primed with epoxy primer, and was considering putting down some rustoleum spray on bed liner on the inside of the fenders. Anybody use the stuff yet?
A rough surface, like bedliner, has little nooks and crannies that will hold dirt and mud moreso than smooth and glossy surfaces. The latter has less surface tension so a strong jet of water can get rid of the buildup more easily. I used Rustoleum gloss black... roll on. It's your truck, it's your call.