Alkyd Paints - Oxidative curing alkyd coatings, sometimes referred to as `Oil based coatings` have been used for thousands of years. Modern day alkyds are a combination of natural drying oils and synthetic resins. A benefit of alkyds is that they are single pack and easy to apply. A disadvantage is that they can be very slow to fully cure.
Epoxy Paints - These were first developed in the mid-to-late 1950`s and are now the most widely used industrial and marine protective coating. They are two-component coatings, packaged in separate containers. One container holds the epoxy resin and the other is the curing agent. Epoxies can be solvent-based, water-based or essentially solvent-free. Epoxies can also be used in powder coating. Epoxies have excellent adhesion, chemical resistance, water resistance and wet adhesion. The disadvantage is they are susceptible to chalking so not suitable as a topcoat outside.
Polyaspartic - Initially introduced in the 1990`s, they are technically an aliphatic polyurea and can be used to achieve very low VOC systems. Polyaspartics are now being used as finish coats to achieve film builds up to 380 microns in a single pass and achieve a high gloss level.
Polyester - These coatings are used in marine and joinery and are two component paints with a rather short pot life of approximately 40 minutes. Once cured they are very durable and can be used for tank linings, decks and to provide a high gloss finish for joinery.
Polysiloxane - These are used where there is heavy abrasion, chemicals, extreme UV or high temperatures. These are very expensive coatings but designed for long life.
Polyurethane - These can be single component or two component products and are very resistant to UV and have excellent gloss and colour retention. The main hazard associated with the use of polyurethane is the toxicity of the isocyanate component. Users must follow safety precautions and an air fed mask should be worn when this product is sprayed. Curing times are fast but pot life is usually around 4 hours.