Formulation of Polyurethane Coatings

Polyurethane coatings are widely used. In anti-corrosion coatings, the first consideration for outdoor anti-corrosion is polyurethane coatings, because they have good weather resistance, gloss retention and color retention. The price is cheaper than fluorocarbon paint. What is the formula of the polyurethane coating?
Polyurethane coatings are divided into polyurethane enamel, polyurethane topcoat, polyurethane metallic paint, and polyurethane overcoat varnish, with different product types and different formulations.
Polyurethane topcoat is a two-component paint mainly composed of hydroxy acrylic resin, pigments, additives and polyurethane prepolymer.