Epoxy primers are primarily recommended as the first base coat over bare steel or concrete. These primers can be used over fiberglass, plastic or black iron phosphate coating. Epoxy primers have strong adhesion, good mechanical ability, and durable chemical resistance in wet and high-humidity environments. Epoxy primers’ bonding capacity is excellent and produces a good surface finish. Epoxy primers not only offer excellent adhesion to metals, but also serve as a proper base for extra undercoat and top coats.