An aqueous coating composition, the aqueous coating composition comprising: a) an acrylic polyester resin, obtainable by grafting an acrylic polymer with a polyester material, the polyester material being obtainable by polymerizing: i) a polyacid component, with ii) a polyol component, wherein at least one of the polyacid component and/or the polyol component comprises a functional monomer operable to impart functionality on to the polyester resin, such that an acrylic polymer may be grafted with the polyester material via the use of said functionality, b) a crosslinking material, wherein the crosslinking material comprises material according to formula (I) wherein R 1 is selected from aryl (such as C 4 to C 24 aryl), or aralkyl (such as C 5 to C 25 aralkyl); R 2 to R 5 are each independently hydrogen, alkyl (such as C 1 to C 20 alkyl), aryl (such as C 4 to C 24 aryl), aralkyl (such as C 5 to C 25 aralkyl) or -CHR 8 OR 9 ; wherein R 8 and R 9 are each independently hydrogen, alkyl (such as C 1 to C 20 alkyl), aryl (such as C 4 to C 24 aryl), aralkyl (such as C 5 to C 25 aralkyl), alkoxyalkyl (such as C 2 to C 40 alkoxyalkyl) or an alkaryl (such as C 5 to C 25 alkaryl); wherein at least one of R 2 to R 5 , is -CHR 8 OR 9 , suitably all of R 2 to R 5 , are -CHR 8 OR 9 wherein the material according to formula (I) forms at least 50wt% of the crosslinking material of the coating composition, a) an acrylic polyester resin, obtainable by grafting an acrylic polymer with a polyester material, the polyester material being obtainable by polymerizing: i) a polyacid component, with ii) a polyol component, wherein at least one of the polyacid component and/or the polyol component comprises a functional monomer operable to impart functionality on to the polyester resin, such that an acrylic polymer may be grafted with the polyester material via the use of said functionality, i) a polyacid component, with ii) a polyol component, b) a crosslinking material, wherein the crosslinking material comprises material according to formula (I) wherein R 1 is selected from aryl (such as C 4 to C 24 aryl), or aralkyl (such as C 5 to C 25 aralkyl); R 2 to R 5 are each independently hydrogen, alkyl (such as C 1 to C 20 alkyl), aryl (such as C 4 to C 24 aryl), aralkyl (such as C 5 to C 25 aralkyl) or -CHR 8 OR 9 ; wherein R 8 and R 9 are each independently hydrogen, alkyl (such as C 1 to C 20 alkyl), aryl (such as C 4 to C 24 aryl), aralkyl (such as C 5 to C 25 aralkyl), alkoxyalkyl (such as C 2 to C 40 alkoxyalkyl) or an alkaryl (such as C 5 to C 25 alkaryl); wherein at least one of R 2 to R 5 , is -CHR 8 OR 9 , suitably all of R 2 to R 5 , are -CHR 8 OR 9 wherein the material according to formula (I) forms at least 50wt% of the crosslinking material of the coating composition, wherein R 1 is selected from aryl (such as C 4 to C 24 aryl), or aralkyl (such as C 5 to C 25 aralkyl); R 2 to R 5 are each independently hydrogen, alkyl (such as C 1 to C 20 alkyl), aryl (such as C 4 to C 24 aryl), aralkyl (such as C 5 to C 25 aralkyl) or -CHR 8 OR 9 ; wherein R 8 and R 9 are each independently hydrogen, alkyl (such as C 1 to C 20 alkyl), aryl (such as C 4 to C 24 aryl), aralkyl (such as C 5 to C 25 aralkyl), alkoxyalkyl (such as C 2 to C 40 alkoxyalkyl) or an alkaryl (such as C 5 to C 25 alkaryl); wherein at least one of R 2 to R 5 , is -CHR 8 OR 9 , suitably all of R 2 to R 5 , are -CHR 8 OR 9 wherein the material according to formula (I) forms at least 50wt% of the crosslinking material of the coating composition, <EOS>