Our warranty on curbing is a 2 years workmanship warranty. Because this type of concrete cures so fast any issues you will have will commonly occur in the first 24 hours. Spider cracks are a concrete issue that can and may occur. Do we ever have issues with them? NO, but you need to be aware. If a crack forms and it’s more than a 1/4-inch-wide, it is operator error and will be fixed. Cracks that occur due to vehicles, heavy mowers, natural occurrences such as tree roots, ground heaving, etc. will not. Common sense really comes into play, when a car drives on landscape curb it’s prob not going to hold up. It mainly depends on the ground underneath. Spider Cracks are a fact of life in concrete and may occur in certain situations.