Penetrating Concrete Sealer. For more porous poured concrete or concrete blocks. Waterproofs and protects concrete driveways against spalling, freeze-thaw cracking and road salts. Permanently seals basement floors and walls against water, vapor, and radon. Coverage 1,000 sq. ft./5-gal. pail on poured concrete or 400-500 sq.ft./pail on concrete blocks.