Gypsum Wall putty is kind of powder that become paste with water and its used to  fix  slight surface irregularities and imperfections such as holes, dents and cracks for walls before painting and its plastering material used to fill holes and patches before painting. This powder paste contain gypsum, calcium carbonate and other additives. Buyformula website will teach you the best method for making gypsum wall putty with economic raw materials. Formulas are available in PDF format file, that described in technical English language.