Polyurethane surface paint is a two-component paint and is composed of polyurethane resin based on aliphatic isocyanate. This paint conforms to the IPS-M-TP-235 standard. The mechanism of hardening is the reaction between the components.
Equal polyurethane lacquer is a two-component varnish of acrylic and isocyanate. How it hardens is the result of solvent evaporation and molecular polymerization resulting from the reaction of two components.