6. Coating Principles

6.1 Introduction

Distinction Between Paints and Coatings

Paints are liquids, pastes or powder products, which are applied to a substrate in a specified thickness to protect the substrate against corrosion.

Coating refers to the process of film formation, physically or chemically upon drying of the paint. Coating is a general term denoting a material that is applied to a surface whereas paint indicates a pigmented material, and varnish refers to a clear lacquer.


Functions of Coating

Historic Background

Many paintings from ancient times date back to first and second millenium BC. Some examples of early coating materials are given below