Method 1: professional touch-up paint. Large and medium-sized musical instruments should be made because I don't know where you are from. Prices are generally from 200 yuan to 400 yuan, depending on the specific situation.

Method 2: Self-painting. After smoothing the injured surface, buy a spray paint can with similar color, spread a newspaper, dig a hole in the newspaper with the same size as the damaged part, and spray it yourself. Disadvantages: It may affect the timbre and beauty.

Method 3: occlusion. You can cover it up with stickers, patches, sticky pads and artistic signatures, which is harmless.

Suggestion: Scheme 3 is still feasible. It is best to design an artistic signature and design the broken part.