Filters: Blue Filter for Panzer Grey Vehicles (AK Interactive) (AK071) (54)Enamel Product. Filters are designed to achieve a subtle tonal variation for especially vehicles in monotone camouflage colors. Shake and apply directly from the bottle with a moist flat brush. This filter allows us to change subtly the base tone of our vehicles in grey or panzer grey making it more accurate and authentic color. At the same time, the filter adds depth and richness to our vehicle, preparing it for the next paint steps. Use the filters