502 Glue shall not be used to stick shoes. 502 glue curing process requires heat exchange, which will release a lot of heat. Therefore, after bonding, the joint will harden rapidly, and burn the leather of the shoes. Some chemicals in the shoe will damage the cloth of the vamp. If the glue is opened again, there will be a layer of hard shell on the sole and bonding surface, which will lose the adhesion and lead to the inability to stick and repair. It is suggested to go to the place where shoes are repaired and find a master to use the special glue for sticking shoes.
502 glue:
502 adhesive is a kind of one component instant curing adhesive, which is mainly composed of α - cyanoacrylate ethyl ester, added with tackifier, stabilizer, toughener, polymerization inhibitor, etc. through advanced production technology, and can stick to most materials. 502 glue is called instant adhesive because it will be catalysed to polymerize, solidify and stick when exposed and exposed to trace water vapor in the air. The chemical molecular formula of 502 glue is CH2=C (CN) - COO-C2H5, colorless, transparent, low viscosity, flammable liquid, single component, solvent-free, slightly irritating, volatile, and volatile gas with weak tear promoting property. 502 glue has certain toxicity, which will be reduced after curing, but 502 glue is a cyano compound, which will produce toxic substances after decomposition. In case of moisture, it will be catalysed, polymerized, solidified and adhered rapidly. The addition polymerization reaction takes place under the catalysis of trace water in the air, which can quickly solidify and be stuck by the adhesive.