Simpson FH05 Crack-Pac Flex-420 Polyurethane Crack Sealer, 5 Gallon Resin w/ Pint of AccelerantThe Simpson Crack Pac Flex H2O polyurethane injection resin seals leaking cracks, voids, or fractures from 1 32" to 1 4" wide in concrete or solid masonry. It is designed to perform in applications where water is seeping or mildly leaking from the crack. The polyurethane is packaged in the cartridge and an accelerator is packaged in the nozzle. When the resin encounters water as it is injected into the crack, it becomes an expanding foam that provides