Fire-retardant, non-combustible inert cement, is breathable and allows for thermal expansion. Portland Cement based and non-flammable like concrete. This is a fast-setting hydraulic cement with exceptional structural strength, which may be used to repair leaks in masonry. Non-shrink and does not contain metallic of any type, therefore it will not rust. Ready-to-use formula; just add water. Dries quickly and will not pull away from the edge.

Made in the USA.