Polyurethane is a type of synthetic polymer made by reacting a polyol (a compound with multiple alcohol groups) with a diisocyanate or a polymeric isocyanate. It is widely used in the painting and construction industries due to its durability, flexibility, and resistance to abrasion, chemicals, and moisture.
In the context of painting and coatings, polyurethane typically refers to a protective finish or topcoat applied over surfaces such as timber, concrete, or metal. It can be either oil-based or water-based, and is available in various sheens (e.g., matte, satin, gloss).
Polyurethane is a popular choice among professional painters and contractors for its long-lasting finish and protective qualities.