Debonding of pavement marking materials is most often caused by an unclean pavement surface. The pavement surface must be free of dirt, debris, curing compound (new concrete only), grease, oil, mud, dust, grass, loose gravel, and other deleterious material that could affect the bonding capabilities of the material to the pavement. In addition, if the material is being placed as restripe over old markings, glass beads and loose or flaking marking materials should be removed from the existing markings. A number of approved methods exist for cleaning of the roadway surface. These methods include: brushing, washing, compressed air, and high-pressure water. Pavement surface preparation should be performed in accordance with TxDOT Specification Item .