The use of abrasives for this job means following each grade with a finer one, but not too fine. You can't remove the scratches and roughness made by a 1000 grade (for example) using a 2000 grade. They are too different and it will take forever when grade steps are wide. The kits sold for doing it contain a sufficiently wide spread of grades that with a reasonable amount of effort, the finest abrasive will provide a surface that will take a polish using the cerium oxide or paste type of thing. Never miss out a grade to make the job quicker because it won't work. Nothing below a 2000 grade or finer will provide a surface that will polish to a totally clear finish.
TC (Ex parabolic mirror maker)
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