Using the adhesive supplied, our markers can be easily applied to metal, concrete, asphalt, or just about any flat non-soil surface. Simply follow the 3 step process; Step One: Clean the surface. Step two: Apply the adhesive supplied to the Adhesive Guide on the rear of the marker. Step three: Permanently stick the marker to the surface. For installations within roadways, the markers should bea) set within the raised profile of manhole lids or b) set within a shallow cored recess. Additional GuidancePlease consider the pedestrian slip or trip potential of the application site.Avoid areas of obvious high traffic such as where manhole lids have been worn away – see example below.Extra care should be taken in the turning circles for heavy vehicles where friction applied to the marker surface can be significant. Demonstration Video