methods of coating a substrate comprising a preparing a coating composition by a method comprising i mixing an epoxidized resin and a solvent to form a mixture ii adding a phosphoric acid compound to the resulting mixture to form a phosphate ester iii adding water to partially hydrolyze the phosphate ester and iv adding a neutralizer to form an adhesion promoter resin b blending the adhesion promoter resin with a non bisphenol a based film forming resin to form a coating composition and c applying the coating composition to the substrate in some embodiments the phosphoric acid compound can be without limitation phosphoric acid superphosphoric acid polyphosphoric acid p 2 o 5 or a combination thereof the methods the adhesion promoter resin compositions and the coating compositions described herein may include any of the features described throughout this application the non bisphenol a based film forming resin may be a conventional coating system that is typically used as a coating composition such as a latex coating composition including for example a styrene acrylic latex composition a polyester coating composition a polyolefin coating composition a polyurethane coating composition a polyacrylic coating composition a polycarbonate coating composition a polyurea coating composition the coating compositions of any of commonly owned published applications wo 2010 100122 wo 2010 100121 or wo 2010 097353 or a combination thereof in some embodiments the adhesion promoter resin composition may be blended with the non bisphenol a based film forming resin in an amount from about 0 5 to about 10 based on total polymer solids or from about 2 to about 6 on total polymer solids in addition the present invention includes coating compositions prepared by a method comprising.