Do you want (and do you want your bike) to be visible in the dark? Then use this spray! It is permanent, reflective and you can spray it on your bike, stroller wheels, poles etc. The spray produces a grey colour that reflects light in the dark. However, if you want to spray clothes and be able to wash it off later, then use the reflective spray for textiles that can be washed off (it does not produce colour; it is transparent).