Garon Products offers their Hy-Speed 500 Instant Concrete for cement repairs. The substance is mixed with water and poured into the targeted area. It has a drying time of about 1 hour before it becomes a concrete-hard mass that's ready for traffic. Because it expands as it sets, Garon feels the patched area becomes three times stronger than ordinary concrete. Available in 5-gallon pails, Hy-Speed 500 needs no priming, leveling or troweling.