johnstones trade smooth metal paint. hundreds colours can be tinted on our tinting machine. select from the ral, british standard and ncs edition 2 colour charts. and of course available in black and white. the johnstone's metal paint is a primer and top coat all in one, giving you up to 5 years protection. dries with smooth gloss finish. apply direct to bare, previously painted or rusted surfaces. paints and protects.