Boss PU 50 is a fast-curing one-component polyurethane sealant that turns into a flexible, durable and resistant elastomeric seam and has a very good adhesion to most industrial materials. Boss PU 50 has high elasticity and excellent tear, vibration and weathering resistance. Easy to apply, it adheres without primer to the most common substrates such as glass, anodized aluminum, lacquered metal, wood, FRP and concrete.