This is white acrylic paint, thinned and applied with a battery powered toothbrush. Once dry I spay areas with windex. (Windex will immediately strip acrylic paint) Patting with a paper towel will remove patchs of paint to make it look worn.

Windex does not penetrate dullcoat. My factory finish is protected by Dullcoat, and then all the weathering can be removed by washing the tank with Windex window cleaner.