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Professional Instruments & Polishing Compounds™

Polishing Scratches Out of Glass

Cerium oxide is usually the best compound for polishing glass. Glass has a hardness of slightly less than 6 in Moh's scale of hardness and will scratch most soft minerals. However, minerals with a hardness of 6 or more will easily scratch a piece of glass. Before you begin polishing a piece of glass you must first determine how deep the scratches are in the material. First run your fingernail across the item to be polished. If you can feel the scratch, it may be too deep to be polished out with cerium oxide and may require more aggressive grinding.

The grit size used to grind out a scratch always depends on the depth of the scratch to be polished. Starting with a fine 1,200 grit size would be best. However, this may be slow. If this is the case you can start with a coarser 600 grit then move to the 1,200 or a 3,000 grit to remove the scratches from the coarser grit size. You can now proceed to polish the glass with cerium oxide. Another great way to grind out the scratches from glass is to use a diamond powder with oil as a lubricant.

After each grinding, clean the area you have ground with alcohol before going to the next finer grit size. Each grit should be used on a clean polishing pad. An electric buffer or drill works best if the item is not too delicate. Mix cerium oxide with water to create a slurry. Apply the slurry to a felt buffing pad. Harder buffing pads made out of hard felt, or leather work best.

The polishing action will go faster when the cerium oxide is damp, but not dry or too runny. You can use a spray bottle with water to keep the area you are polishing damp. You can use 99.9% cerium oxcide. However, it can be a bit more expensive than the 90% Optical grade which will work fine on most glass.

Moh's Hardness Scale
Hardness is measured on the Moh's Scale, identified numerically hardness of by standard minerals, from 1 (softest) to 10 (hardest):

1. Talc
2. Gypsum
3. Calcite
4. Fluorite
5. Apatite
6 .Orthoclase
7. Quartz
8. Topaz
9. Corundum
10. Diamond

A mineral of a given hardness will scratch other mineral of a lower number. With a systematic approach, you can use minerals of known hardness to determine the relative hardness of any other mineral.

The CrystalClear® Pro Polishing Kit
Large Polishing Kit With Special Cloth
(1) The CrystalClear Metal & Plastic Polish to remove scratches & give a mirror shine to watch bands, cases, acrylic watch crystals, fine jewelry, silverware, aviation metals, nautical, automotive metal & plastic parts. (2) The Pinnacle Brushed Satin Finish also removes scratches & gives a protective shield but leaves professional brushed satin finish. (3) Our exclusive super sized finishing cloth.
Recommended For Use With Our CrystalClear & Metallux Polish
Recommended For Use With Our Brush Satin Polish
Polish, Buff, Sand & Shine With or Pro Rotary Tools

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