High solids and low viscosity polyamide curing agent HW-503 suitable for coal tar epoxy system coating materials Polyamide Epoxy Resin HW-503 is a low molecular weight polyamide curing agent with high solids and low viscosity, which is formed by the condensation of multistage fatty amines and fatty acids, with good flow performance, fast curing speed, long pot life. It has good paint film after curing with epoxy resin,Good adhesion, excellent flexibility, excellent water and