Enamel Product.
A very special product for doing streaking grime effects over dark grey surfaces such as German vehicles painted with Panzer Grey. Also suitable for other effects such as add chromatic richness to any piece or surface. This enamel should be mixed well and then painted in vertical lines on the sides of the model. After, you just blend with a clean brush moist with Enamel Thinner to produce some great realistic streaking grime effects.