Previously we had done crack treatment, urethane caulking, crack guard (paint) etc., but I have been using it since this product was out. It enters firmly in the crack, and the mark of the crack is completely inconspicuous! The bad site of the crack which was constructed in Katori city in Chiba prefecture before the Great East Japan Earthquake was broken from its side because the construction site did not break. I would recommend it! I am happy that you can choose more colors!