Polyfix Ready Mix is ready to use as a fine surface filler ideal for smoothing surface imperfections. When filling deeper imperfections use several thin coats. It can be applied on most porous surfaces. Polyfix Ready Mix is non-sagging, has little shrinkage, dries white in color and can be sanded when dried. Polyfix Ready Mix is available in 2, 8 and 16 fl. oz. containers.