with a primer over the conversion coating suitable primers for this invention include epoxy acrylic polyester or polyurethane resins as binders u s pat no 5 001 173 is incorporated herein by reference for its description of primers that are suitable here the primer thickness may be from 0 2 mil to 1 6 mils preferably about 0 8 mil or more flexible primers are preferred when the coated metal stock is to be post formed in the manufacture of a roofing shingle greater flexibility may be achieved by the use of thick film primers such as are described in u s pat no 5 688 598 which is incorporated herein by reference and are available from morton international inc the peak metal temperature pmt for the curing of the primer is that recommended by the supplier but it is usually in the range of 435 465 u00b0 f about 225 240 u00b0 c pigments such as those described below in regard to the topcoat and embedded particles are used to impart ultraviolet light resistance to the primers also for the purposes of this invention the liquid resinous coating composition preferably comprises an ultraviolet light resistant pigment and a thermoplastic or thermosettable fluorocarbon resin as used herein a fluorocarbon resin is a homopolymer of vinyl fluoride or vinylidene fluoride or a copolymer of either of those two monomers with one another and or other copolymerizable fluorine containing monomers such as chlorotrifluoroethylene tetrafluoroethylene and hexafluoroethylene fluorocarbon resins are available under the trademarks kynar u00ae and hylar u00ae fluorocarbon resins and coating compositions comprising a fluorocarbon and an acrylate or methacrylate monomer or mixture of the two are.