Polyurethane is an organic compound made through the reaction of glycol and isocyanate. It has great moisture and corrosion resistance characteristics. For this reason, polyurethane sealant is useful in in commercial and industrial application. It is often used for a strong adhesive, as well as a coating. It is also loved for its flexibility.
It may be pressed, layered, sprayed, or brushed into needed areas. The most common method of application is with a caulk gun. Common problems are the expansion and contraction of the joint. Polyurethane is known for its resistance to cracking due to movement of the joint materials.
A quality polyurethane sealant will adhere to masonry, wood, concrete, steel, aluminum, vinyl, and most plastics.
Polyurethane sealants are easy to use, long-lasting and very versatile. They have a wide-range of applications. I have used polyurethane for glazing/caulking with glass, stone and tile construction and painting. This method improves structural integrity, has a more stable adherence, and resists tearing and weathering. They are available in a wide range of colors and are paintable. This method enhances the aesthetic appearance of any structure you may be working on.