4930 Polyurea Crack and Spall Filler is a low viscosity, two-component repair material designed as a ridged repair material for cracks, joints, and other imperfections in concrete. It’s a fast-drying material featuring an easy 1:1 mix ratio and boasts a low odor VOC-free formulation. Use it to fill cracks, spalls and divots and be ready to grind smooth in 20 minutes.