A paint system normally consists of
1-Primer
2-Intermediate coat(s)
3-Topcoat(s)
The important properties of primers are
1 Adhesion (Strong Bonding)
2 Cohesion (High Internal Strange)
3 Inertness (Strong Resistance to Corrosion and Chemicals)
4 Inter-Coat Bond (High Bonding to Intermediate Coat)
5 Appropriate Flexibility
The principal purposes of an intermediate coat is to provide
1 Thickness for total coating
2 Strong chemical resistance
3 Strong cohesion
4 Strong bonding to primer and topcoat
5 Provide electromechanical resistance
Topcoats perform several important functions like:
1 Provide a resistant seal for the coating system
2 Form the initial barrier towards the environment
3 Provide resistance towards chemicals, water, and weather
4 Provide a tough and wear-resistant surface
5 Provide a pleasing appearance
6 Provide UV resistance
