It is known for colored plastics caps to be pushed by a customer onto heads of metal screws, after the screws have been secured to sheets of colored cladding or roofing. It is also known for the caps to be molded around the screw heads by a manufacturer. In the present invention, a screw/cap assembly is formed by bonding an initially separate cap onto the head of a screw by means of an adhesive, such as an epoxy resin sufficiently strong to allow the screw to be driven while the cap is in place. The intention is that the manufacturer would maintain stocks of the caps and stocks of the screws of different types, and only secure predetermined caps onto the heads of predetermined screws in response to specific orders from customers.