This is how your bike should look in the dark if you want to cycle safe! This spray is resistant to wind and weather; it is an excellent complement to regular reflective items. The spray produces a grey colour that reflects light and is permanent. It works on most materials: metal, wood, concrete, plastic etc. Perfect for stroller wheels, bike wheels, curbs, gate posts and letterboxes, everything you want to be seen in the dark. Spray on a clean, dry surface. You may need to spray again, depending on how much wear and tear the surface is exposed to.