A coating composition having self-scratch healing characteristics comprising aminoplastic resin crosslinked polyester polyol resin comprising condensation product of carboxylic acids and polyols including one or more renewable polyalkylene glycols is provided. A synthesis method for manufacturing said coating composition involving melamine cured shape memory polyester or polyester/acrylic blend coating is provided wherein, by specifying the thermosetting composition and cross linking agent of the said polyester or polyester/acrylic blend coating resin, clear coat film having excellent self-mending ability under ambient conditions and good mechanical hardness under baking conditions is provided.