Rainmarks Effects (AK Interactive) (AK074) (9)Enamel Product. A unique Streaking Grime effect specifically designed for vehicles painted in a tri color camouflage scheme like those used by NATO but can be used in any vehicle. Create realistic streaks and rainmarks with this light colored enamel effect. Shake well before use. Apply your streak with a fine pointed brush in irregular vertical lines from lower parts on sides and let the paint dry for about 10 minutes. Next take a flat brush moisted