You need to grind your glass at 400 or higher grit, followed by resin bound smoothing and polishing discs. Any rougher surface will not enable the cerium polish to work.
Many do not like to use cerium oxide as it is messy. Especially so on a wet belt sander as the speed is really too fast for the use of polishing pastes. The speed sprays the slurry all over the place. You need a felt wheel or belt to which you apply the cerium oxide. First you mix the cerium with water to a yoghurt consistency and apply that to the wheel or belt. Begin polishing and add more water and cerium paste as the polishing surface dries. You will notice this as the glass will begin to drag. Do not delay, add more of the paste before continuing. Otherwise you will heat up the glass and risk breakage.
His Glassworks has good descriptions and videos on use of cerium oxide.
It is helpful to mark the glass with a paint or china marker before starting the polishing process to show the areas that are to be polished. This enables you to see what work has been done without completely drying the piece.
Revised 4.1.25
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