Purpose of coating: to enhance beauty, correct defects, improve durability, expand and increase the variety of colors and patterns
Defects that may occur in coating: brush marks, slurry flow, coating grains, sticky coating, white coating, scattered light, cracked coating, slurry shedding, poor resistance to dry and wet rubbing
Requirements for coating: appearance, adhesion, elongation, hygienic performance, heat and cold resistance, aging resistance, color fastness, resistance to solvents, acids, alkalis, salts, oxidants, etc.