Akfix P635 Polyurethane Sealant, Masonry, Glazing, Concrete Joints, Driveway Cracks, Flexible & Paintable - Gray, 10.5 fl oz (Pack of 12) Possesses permanent flexibility, no shrinking, no sagging - excellent performance in moving joints Can be applied with hand gun and tooled easily Cures bubble-free, no surface tackiness after fully cured, does not pick up dirt, paintable. Rated for 25% movement capability. Akfix P635 sealant is a one-part moisture curing, gun grade PUR Sealant.