Minipolishing or how to get rid of scratches

In various consumer electronics, protective glass is often made from plexiglass. This is a good material, if not for its one drawback - scratches can easily appear on it. We tried to describe the most affordable technology for polishing plexiglass, which will allow you to get rid of scratches on the screens of mobile phones, players and other electronics. In addition, it is possible to polish even small metal products (for example, polish a coin to a shine). To create the device we need:
1) Small electric motor
2) GOI paste - polishing paste based on chromium oxide. You can easily buy in tool stores and in most hardware stores.
3) Cotton buds
4) 9 volt battery (or other voltage, depending on the motor)?
We cut a cotton swab and put it on the motor shaft. You need to turn on the motor so that the cotton wool, when it touches your fingers, spins and does not fluff.
Put a little GOI paste on a rotating stick.
Our test sample is a piece of plexiglass on which the word Licrym was scratched with an awl. We proceed to polishing. With slow, gentle movements, we move the stick’s rotary end over the scratch without stopping in one place (if we linger, the paste will squeeze out and the cotton wool will rub dry plexiglass, as a result of which it will heat up and melt, there will be a hole)
The paste, although very thin, but abrasive. Gradually, the material at the edges of the scratch is ground to the level of the bottom of the scratch, and such a smooth hole is formed. As a result, we get a smooth recess repeating the shape of a scratch, but already without sharp, light-scattering edges. This means that the scratch is not visible.
After 10 minutes of polishing the “Lic” part, we achieved the following result:
If you look through it, it’s impossible to say that there were letters at the polishing place. Their blurry silhouette can only be seen at an angle in reflected light.
Source: licrym.org