Duropur Flex Hydrophobiic is a low viscosity hydrophobic polyurethane formulation. The system is comprised of a base resin along with an accelerator component. Flexible is typically used to repair cracks or failed joints in concrete structures. Duropur Accelerator is used by the experienced installer to manipulate the reaction profile as warranted by job site conditions. Being a hydrophobic formulation, when reacted with minimal amounts of water, the resulting foam will maintain its physical form and not be subject to shrinkage due to wet/dry cycles. Flexible produces a closed cell polyurethane grout.