It is a car scratch pen or car scratch remover，you can name it as you want . Actually it is a bottle of Advanced Car paint with a small Brush in it . So you can not only use it on your vehicles but also on your boat, Motorcycle, bike, fridge, door, desk, floor etc. even DIY paintings . As long as the color matches your stuff ,you can use this pen to cover the scratches on it . but never ever on your skin or fingernails or any place you don't want to use it .because this paint is really really hard to be cleared . waterproof is just the basic function . the paint can prevent heat Rust oxidation etc. So please keep it away from kids. How to use it: 1.Clean the scratch area before use. 2.Remove the wax of the scratch area. 3.Remove the iron rust. 4.Shake the pen about 10~40 times before using. 5.Please use in sunny days to ensure product effectiveness you can use it on rainy days but it will take more time to dry.