How To Apply MasterProtect HB 400 Coating Ensure substrate is structurally sound, fully cured, dry and clean Mix thoroughly before applying. Apply by brush, roller or sprayer. Apply coating using an 'N' pattern Cross-roll through coating to ensure uniform wet mil thickness Check wet film thickness to ensure application at specified rate Back-roll in same direction to create a uniform appearance Refer to the MasterProtect HB 400 technical data guide for more information.