The problem you mentioned can be said to be very popular in the industry now, and it is certain to make money, but the premise is to have the technology of paint matching, color difference and fineness. Nowadays, many car plastic painting shops use paints prepared by professionals, and there must be enough customers, mainly your local car plastic shop and 4s auto repair shop. Of course, if your profits are decreasing, then you are not far from success, and it is also violent. Oh, it will help you.