It is acrylic rubber putty, used to repair cracks in walls, ceilings and floors. This material consists of chemical materials that fill the cracks and treat them from the inside. It is characterized by its high elasticity and is used for interior and exterior work. It is well resistant to moisture and heat. Buyformula website will teach you the best method for making this paste. Formulas are available in PDF format file, that described in technical English language.