You will need
  • - pieces of thick leather or felt;
  • - polishing paste (for example, GOI), toothpaste, mineral oil.
Can I return the time glass the original form at home depends on what material is made hour glass. The most common and cheapest option – organic glass. Less common natural glass. The most rare and therefore most expensive option is the sapphire glass. It is made from artificially grown crystal and it is often applied anti-reflective coating. Sapphire glass is characterized by great hardness of the surface, so scratch it very hard. But sometimes it still happens.
Carefully remove the glass, start moving it waves a piece of leather or felt, covered with a mixture of polishing paste with water. If the scratch is very shallow, barely noticeable – take to work the fine-grained paste for fine work. For example, paste GOI (from the abbreviation "State Optical Institute") is divided into coarse (4), medium (number 3) and thin (rooms 2 and 1).
After some time wash the glass, dry thoroughly and evaluate how successful was the work. If the scratch is almost gone, apply a new piece of leather or felt a little toothpaste, add a few drops of water and again RUB the glass wave-like movements. After some time, wash, dry, RUB the glass a little mineral oil. It will look like new.
If the glass is natural, right tune that the work will take much more time. Because the material is much more rigid than organic glass. So it makes sense to start with coarser paste GOI (4), gradually replacing its middle, and then thin. Otherwise, the algorithm does not differ from that described above.
Well, if you have a sapphire crystal, not worth the risk, because the material in addition to hardness highly brittle, sensitive to impact. When repairing the home is the glass easy to crack. So better take your watch in for service.