Sikaflex -221 is the most well known brand of one component polyurethane sealants/adhesives. This fast curing product provides permanent elastic adhesion to a number of surfaces with excellent cut and tear resistance. The ultimate choice in truck, trailer, RV, and bus manufacturing. Designed to resist the shock and abuse encountered over countless road miles, Sikaflex -221 will maintain its strength and adhesion over the long haul. Sikaflex -221 is weather-resistant, sandable, paintable, and NSF-approved for potable water and incidental food contact. Maintains its strength & adhesion over countless miles Weather-resistant Sandable & paintable | AP Products Sikaflex -221 Multi-Purpose Polyurethane Sealant/Adhesive, Black, 300 ml