CrackWeld PRO Concrete Floor Repair Kit &ndash; Seal Cracks In A Basement Floor, Driveway, Garage, Patio, Pool Deck Very low viscosity to also fill hairline cracks  no need to route out cracks (unlike epoxies) Fast-curing (ready in half an hour for overlays or heavy traffic) High-strength bond (stronger than concrete) to prevent elongation and yawning of cracks