This homeowner had a concrete slab in their backyard that was beginning to crack. In order to keep the concrete from shifting, our polylevel team sealed the cracks with NexusPro Joint Sealant. NexusPro is a silicone-based sealant for joints and cracks specially engineered to provide long-lasting flexibility and to stand up to harsh weather conditions. Unlike traditional polyurethane sealants, NexusPro resists UV rays, which means it won't crack, bubble or dry.