Hi all. I want to restore some faded black trim. The trim looks black when wet but not so black when dry. Carpro and gTechniq have competing solutions for this problem; DLux and C4 respectively. I'm leaning more toward C4 because it's supposed to be permanent (at least 2 years) coating. Does anyone have some experience C4 durability they would like to share? Both these products are up there in price.