The Energon Pub

It's not quite as controversial ans Rumble and Frenzys' colors, but Ratchet's helmet color is something Hasbro got wrong on the Classics figure. (Of course, they got a lot wrong, but I couldn't afford the Henkei version and I'm glad I didn't end up paying thirty bucks for this mold...) Does anyone know the cheapest/most accurate red paint I could get to correct the color of his helmet?