Not sure if you can grind it? Slap some wax on it and find out! This skate wax by Dope Skateboard Wax is specifically made to reduce friction on grinding surfaces like rails, curbs, ledges, or wherever else you shred. Reduce the damage done to your board and nail those grinds with Dope Skateboard Wax Black Hash Original Formula Skatewax Bar Includes: One (1) Dope Skateboard Wax Black Hash Original Formula Skatewax Bar from Dope Skateboard Wax. To use: Find your sweet spot on the curb or rail, rub the Dope Skateboard Wax Black Hash Original Formula Skatewax Bar into the edge of the curb or grinding rail as hard as possible, until you see it start to cake onto the edge. Give it a good covering over the corners, top, and side, covering the entire surface. Grind the surface with your skateboard repeatedly until the wax blends with the surface, making it slick and easy to grind. Remember: property owners and law enforcement often regard waxing curbs as vandalism. So watch what you wax! Also, remember to be careful since your speed will surely increase!