Waterborne Polyester Resin for Wheel Hub & Frame High-Gloss Silver Amino Baking Coatings Product Overview WL-189 is a self-emulsifying waterborne polyester resin supplied as an unneutralized raw liquid with a solid content of up to 71%. Designed for industrial baking coatings, this product meets requirements for high hardness and excellent fullness. Physical Properties Properties Units Values Appearance --- Light yellow liquid Solid Content % 71±2 Viscosity (30°C) mPa.s 10000