If they can only be used several times, isn’t it more cost-effective to replace the entire piece of glass?
Answer: A kit (a coarse grinding sheet, a fine grinding sheet, and a polishing pad) of 3 inches can be used at least 10 times for repairing a 5 cm long general scratch. Its cost is RMB 2.7 according to the market price of grinding sheet. This price is acceptable to most customers. Cost-effectiveness is associated with the actual product. Generally, repair is more cost-effective when a large piece of glass has a few scratches or when a piece of glass difficult to replace has many scratches; replacing is more cost-effective when a small piece of glass easy to replace has lots of scratches.