Automobile polyester mastic made from polyester resin and other chemicals. It has great refilling capacity, excellent adherence, easy sandpapering and quick drying within 8 minutes. It is specially designed to fill dents and irregularities in car body and general metallic surface. Buyformula website will teach you the best method for making automobile polyester putty. Formulas are available in PDF format file, that described in technical English language.