AP Products 017-90892 Sikaflex-221, Aluminum Gray Sikaflex is the most well known brand of one component polyurethane sealant/adhesive in the world This fast curing product provides permanent elastic adhesion to a number of surfaces with excellent cut and tear resistance Designed to resist the shock and abuse encountered over countless road miles, Silaflex-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