Stafford -- To repair this concrete we used our three-part Concrete Protection Services. First, we inject our PolyLevel foam underneath the concrete to lift, level, and stabilize the concrete slabs. Second, we use our NexusPro to fill in the joints to protect the ground underneath the concrete from further settlement. Lastly, we use our SealantPro to seal the concrete and protect it from future oil, water, and salt stains. These three products together gave the customer a 10 year warranty!