SikaFix® PU is a low-toxicity, two-component, 100% solid, polyurethane foam. It will displace and stop flowing water, forming a tough flexible foam, firmly bonded to the concrete surface. SikaFix PU can be used to stop water under a hydrostatic head and provide a resilient tough and flexible, closed cell polyurethane grout. Can be used for cracks in tanks, tunnels, pipes, basements, pools, subways or any structure where water intrusion must be stopped.