the method of making a friction locking fastener of the type having in the thread grooves a first deposit formed of a mixture of an uncured epoxy resin and a radiation - curable , film - forming material , and a second deposit of a fluid curing agent and a radiation - curable , film - forming material . the deposits are made in the thread grooves at circumferentially spaced locations so that a very thin coating of the radiation - curable , film - forming material develops at the surface of each deposit . the deposits are subjected to high intensity ultraviolet radiation for a few seconds to transform the coatings developed on the surfaces of the deposits into thin , continuous , flexible , non - tacky protective films which cover the still fluid deposits in the thread grooves of the article . alternatively , when one or both the resin and the curing agent are microencapsulated . they may be contained in a single mixture which includes the radiation - curable material . that mixture , when deposited and exposed to radiation , will form a protective film at the surface . the resin will not be polymerized until the capsule are ruptured .