Acrylic Sealant fills and waterproofs cracks.
Press Release Summary:

Original Press Release:
Con-Crax® Economically Seals and Waterproofs Cracks
CON-CRAX® is a pourable, self-leveling gray crack filler for exterior concrete. This acrylic sealant remains flexible to resist cracking during seasonal weather changes. CON-CRAX is also an economical way to repair concrete damage because it is ready to use right from the bottle.
CON-CRAX requires no mixing or troweling and dries quickly to form a strong, watertight seal. Its color blends with the surrounding concrete to make it ideal for use on driveways, sidewalks, parking lots or stairs. For a no-mess repair, just squeeze directly into cracks up to 1/2" wide and 1" deep.
CON-CRAX is available in one-quart bottles, one-gallon bottles, or five-gallon pails. (One gallon fills 60 ft. of 1/2" x 1/2" cracks.)