RadonSeal CrackWeld DIY Concrete Floor Repair Kit (2-Pack) - Easy Repairs of Cracks in Basements, Driveways, Garages, Patios, Pool Decks Permanently repair cracks in concrete floors and slabs (hairline up to 1/2 inch wide) No need to route the cracks before application Fills the full depth of the crack and cures as a rigid compound that is stronger than concrete Complete kit includes all materials needed - you only need a standard caulking gun Bonds tenaciously to concrete