US joint agent product is in sealant or caulking or concrete floor processing again, to slit the surface smooth, delicate and thus prevent the stain into effect. US joint agent has two types of matte and shine, shine products of normal use. The principle of construction after the film (somewhat similar correction fluid), smooth surface, good waterproof effect and so on. First is increasingly widely used on tiles, ceramic stone, the whole cast glaze construction gap is small, high surface brightness in building materials. US construction joints agent proper effect is very obvious, but there are obvious shortcomings: 1, the construction of trouble, twice the construction. And to ensure that after construction of the first surface has a smooth concave, if construction and brick-high, walking with the crowd, the United States will be the whole seam agent off, so the US joint agent are professionals in the construction market , General Mason could not handle. 2, there are strict requirements for the wind section, than 1.5mm gap deprecated US joints agent, due to its shrinkage, after much use as shrink US slit joints agent also occur off phenomenon. 3, fast curing time, slow construction, construction only 20 cm each. Otherwise it can not be caulked. 4, can not be soaked in water for a long time, because of its material is acrylic, long-term flood damage will dissolve. 5, limit the use of premises, outdoors, where temperature changes are not be used, otherwise easily lead to fall off. 6, general environmental performance, easy to grow bacteria below the US joint agent. ?