| #1 for areas that are rounded and compound curved i use a heater hose , left over from other repairs it conforms well to many areas ( see pic ) , #2 also to mask off tires i use large garbage bags , but keep in mind this is primering only , make sure to not have plastic where you are final coating , after one dry coat of paint on plastic it can dry and then flutter from the air of a paint gun and come loose and then into the next coat of new paint , ( see pic ) use paper or a old blanket to cover the plastic bag . | 
