Acrylic mastic sealant are special acrylic paste used for gap, holes and cracks filling and have varying degrees of flexibility and its over paintable. Acrylic mastic sealant are used in construction industries for floorboards prior to leveling work,  sealing of cracks and joints in masonry, plaster, concrete, porous concrete, gypsum blocks, also it have many applications. Buyformula website will teach you the best method for making acrylic mastic sealant with economic raw materials. Formulas are available in PDF format file, that described in technical English language.