Henry 305 Driveway Elastomeric Crack Filler. Asphalt based material for effectively filling cracks in asphalt pavements. Ready-to-use straight from the container, Henry's Driveway Elastomeric Crack Filler gives do-it-yourselfers an easy way to fill minor cracks in home driveway surfaces. It is a unique elastomer-modified asphalt base emulsion produced by incorporating the rubber polymer into the asphalt using extreme pressures and temperatures.