Used some Apple Barrel 'pool blue' paint found in Walmart's craft section, and it stuck to the metal like a charm. Wanted that extra shade of blue on it like the original has. Comparisons- Added red to the engine exaust . Felt he needed the detail since his rear is uncovered and his robot mode is showing. Did'nt have a red paint marker so I dipped an empty panel lining pen in some red paint and poked it in there. Still need to touch up the square part though.