(i) Epoxy resins Chemicals which may be produced from petroleum and natural gas are the source of epoxy resins. These
paints have very good adhesion, apart from their excellent chemical resistance. They may also have good flexibility and
toughness where co-reacting resins are introduced. Epoxy resins are expensive owing to the removal of unwanted side
products during their manufacture, and the gloss finish may tend to ‘chalk’ making it unsuitable for many external decorative finishes. These paints often consist of a ‘two-pack’ formulation, a solution of epoxy resin together with a solution of cold curing agent, such as an a mine or a poly amide resin, being mixed prior to application. The mixed paint has a relatively slow curing rate at temperatures below 10 °C. Epoxy resin paints should not be confused with epoxy-ester paints which are unsuitable for underwater use. Epoxy-ester paints can be considered as alkyd equivalents, as they are usually made with epoxy resins and oil fatty acids.