99.95% pure Cerium Oxide powder, with average particle size of 3.5 microns, for the fine polishing of glass – instructions included. Ideal for use in restoring lightly scratched windscreens, windows, aquariums and shower doors, as well as a host of other glass articles – in fact any glass that doesn’t have a surface coating. Also useful for final polishing in stone tumblers and for lapidary. This product will remove light scratches from glass, but please be aware that any scratch deep enough to be felt with a finger nail is too deep to be removed with this product. The Cerium Oxide will need to be mixed to a paste with water and kept wet while in use. It will have to be used with a polishing pad in a power drill to be effective. If this is the first time that you will have used Cerium Oxide, then we strongly recommend that you look on youtube for instructional videos. This is a relatively easy material to work with, but overheating of the glass during the polishing process can easily lead to cracking – please ensure that you are familiar with the process before starting work.