(This paragraph is non-mandatory and will not supersede specific use requirements in contract documents.) These paints are intended for use on concrete, bituminous, brick, or stone surfaces of airfields, highways, bridges, tunnels, streets, or parking lots when applied at a wet film thickness of 0.33 mm (0.013 in) by traffic-striping equipment designed for water-based paints. The white and yellow paint stripes should preferably be reflectorized for night visibility by adding glass beads conforming to TT-B-1325. A wet film thickness of 0.457-0.635 mm (0.018-0.025 in) is commonly specified when Type IV A beads are used and 0.381-0.457 mm (0.015- 0.018 in) is commonly specified when Type IV B beads are used. The black paint is intended for use as a border around markings on light-colored pavements and as an obliterating paint for painting out existing markings to permit remarking in a different manner.