Sticky, one of the steel fabricators used to do primed plate to order, Giovencos I think, but if its a small Quantity probably not ecenomic, your best bet may be to get the black plate & get a blasting firm to blow over it- there was one or two at Shell point slips in Taren point. Make sure the primer is a geniune " weld through" & part of a compatible system for your coating system for the
repair & also not applied in too heavy a fashion as this can affect the welding ease particularily with mig or grind off in way of weld zone(recomended anyway). Regards from Jeff