The AquaBond DMK-377 is a Polyurethane Foam Kit w/ Applicator. The DMK-377 Kit is the perfect companion to our AquaStitch crack stabilization system. When you use the DMK-377 Kit to permanently fill the entire length, width and depth of a concrete pool crack, then stabilize it with our AquaStitch mechanical stitches, you have performed the ULTIMATE in concrete swimming pool crack repairs!