000 any combination or mixture of poly c 6 c 7 and c 8 alkyl isophthalamides may be used poly c 6 c 7 and c 8 alkyl isophthalamide resins also can be used individually high temperature resistant resins suitable for practicing the embodiments described above include amodel u00ae which is available from amoco performance products inc atlanta georgia maximum temperature limitations for patches made of the resins disclosed have been found to exceed 400 u00b0 f based on tests made at 450 u00b0 f for best results the fasteners should be cleaned and degreased before application of the self locking patches of this invention in particular care should be taken to ensure freedom from oil grease wax and heat treating scale if cadmium or zinc plating is desired it should be applied after the application and fusion of the self locking patches b second embodiment using premixed high temperature resistant resin powder mixed with adhesive in a second embodiment an adhesive is first mixed with the high temperature resistant resin particles a suitable optional powdered adhesive is poly oxyl 1 4 phenyleneisopropylidene 1 4 phenyleneoxy 2 hydroxytrimethylene having a weight average molecular weight m w of about 60 000 to 65 000 a number average molecular weight of 25 000 to 30 000 and the structure shown in fig9 in addition depending on the type of high temperature resin material and or adhesive used it may be desirable to include multiple heating and spraying stations such that the fasteners are first heated then sprayed with high temperature resistant resin powder mixed with adhesive then reheated and again.