Henry Gallon 305 Driveway Elastomeric Crack Filler. Fills cracks up to 1/2 in. wide. Provides a tight and flexible seal in asphalt driveways. Resists water, weather and high temperatures. Ready to use straight from the container. Let filled cracks cure at least 7 days or until firm before coating is applied or when temperature will fall below 50 degrees Fahrenheit within 24 hours after application. Hose or blow off loose materials, dust, and dirt from cracks. Cracks should be damp but free of standing water.