Coatings generally include volatile and non-volatile components. Both types of ingredients have their uses. After the drying and curing process, non-volatile components remain on the coating, while volatile components are released into the surrounding air. Volatile components include solvents and fission products.

　　The proportion of volatile substances depends on the specific coating system and application conditions used. Coatings used in the automotive industry generally contain 50-80% solvent (depending on the specific coating type). The filler contains about 50% solvent, the top coat is 80%, and the varnish is between 35-50%.