How to paint separate parts? (Car Mechanic Simulator 2018)

Collected the car, bought at the dump. The whole was restored, moved to paint, painted the whole car, and parts that were purchased in a store in a different shade, ie painted Dodge blue, the body became like like blue, and items from the store a little lighter. As a paint, or what to do. In the coating there is a point varnishing item, but it is not active.