502" is a one component of cyanoacrylate adhesive with many excellent characteristics without solvents and heat. It cures rapidly at room temperature and forms extremely strong bonds. And "502" can bond almost all materials such as metals rubbers plastics etc. If the surfaces are covered with dust or grease the curing speed will be lengthened and the bond strength will also be weakened. Before using make a small hole on the top of the bottle nozzle with a pin. Apply only a drop to one surface. then press the surfaces quickly together. The amount of "502" used is as small as possible. After used clean the nozzle and cover with the cap. Store in cool and dark place.