Phenolic Resins in Coating Applications 
The very good properties and characteristics that make phenolic resins good adhesives and molding compound as also make them a very good protective, environmental, high temperature, and anti-corrosion coating for a variety of materials, such as aluminum, bronze, iron, and magnesium.
Phenolic coating resins have good wetting and adhesive properties, and very good chemical and abrasion resistance. The baking step in coating production involves a crosslinking process. Crosslinking makes the coating insoluble, strong, and resistant to exposure to chemicals, solvents (except alkalies), and hot water. It also makes phenolic coating resins tasteless and odorless.
Phenolic coating resins are good electrical insulators. Dielectric strength for phenolic coating resins is about 500 V/mm; dissipation factor and water absorption are very low.
Phenolic coating resins have good thermal resistance with a continuous-use temperature of 145°C and can withstand high temperatures up to 350 °C for short periods.
Phenolic coating resins exhibit flexibility and compatibility with other resins, such as polyurethanes, epoxies, alkyds, and polyvinyl butyryl, and can be easily modified to suit various applications. Also, phenolic resins are sterilizable and can be used for food applications where sterilization is a Food and Drug Administration requirement.
Major coaling applications are as protective coatings, undercoats, and primers for automotives; metal containers and pipes; and industrial equipment. Examples of specific applications of phenolic resins, such as coatings, are in heat exchangers, pipelines, boiler pipes, reaction vessels, storage tanks, brine tanks, solvent containers, food containers, railroad cars, beer and wine tanks, beer cans, pail and drum linings, water cans, rotors, blower fans and ducts in heating and air conditioning systems, boats, ship, wood finishes, and paper.
Because of their versatility, phenolic coating resins, can be applied by most available coating technologies, such as dip and spray (pneumatic and electrostatic) coating in solutions, high solids, and powder forms. Georgia Pacific Resins, Inc. and other plastics companies offer a variety of grades of coating resins. A particular coaling application can have more than one resin type, for example, a rail car could have an epoxy primer, a modified phenolic undercoat, and a polyurethane finish.