WQ-PR431 WQ-PR431 is a water-soluble saturated polyester resin with moderate molecular weight and excellent coating film properties. It delivers good overall film performance, high gloss, good storage stability, and a well-balanced combination of hardness and flexibility. It is mainly used in waterborne coil coatings, metal baking coatings, and other related fields. With low emissions and outstanding overall performance, it meets the needs of the eco-friendly market while