I have used this product a few times over 4 years, and it performs better than anything else on the market. I t takes a bit of time, but it is worth it. It is imperative that the directions are followed, and that the crack is clean and dry. I can't recommend any thing else for filling cracks. I have a wide and long drive, I have filled over 100 feet of cracks with this product, without any failures. It also seems to stop ants from excavating upward through the crack in addition to making it completely waterproof.