It is a single part adhesive which requires no mixing or special surface preparation. The das Curb Marker Adhesive provides a permanent bond to concrete, asphalt, metal, or just about any flat non-soil surface. It can be used to apply das Curb Markers to vertical or horizontal surfaces. Black in color. Recommended application temperature range is 40-90 F. It will skin over in an hour, be firm within 2 hours, and achieve a full cure within 18 hours.* It will remain resilient and withstand freeze-thaw conditions without loss of adhesion for years.