If you are painting bare metal, we would always recommend the use of an undercoat or primer coat first. Regal Skip and Container Paint is made with extra anticorrosive materials, more than regular metal enamel so does give more corrosion protection. This is designed for quickly overspraying existing skip paint or container paint as we know our customers need a speedy turnaround. Our primer paint is designed for bare metal or spot priming, creating an anchor between the metal and the metal paint. So yes, ideally use our red oxide primer or grey oxide primer to undercoat bare metal. Always prepare the surface thoroughly prior to painting.