The corrosion can spread into areas where the epoxy coating remains intact, making it harder to diagnose the areas that need repair
I understand that building materials are often outlawed after decades of widespread use, often growing out of a former misunderstanding of the safety and danger in long term human exposure. This happened in the late 1980s with the Montreal Protocol and the widespread agreement to outlaw the use of harmful refrigerants and propellants that were causing serious ozone depletion at the time. Nowadays you cannot buy freshly manufactured R22 coolant for air conditioners, only new-old-stock. Most heating and cooling suppliers and businesses will recommend HVAC systems that utilize other, safer forms of refrigerant that don’t deplete the ozone like R22. While not necessarily an environmental concern, epoxy coated rebar is being banned and re-evaluated in a number of areas because of what happens during its application in construction projects. While shown to be amazingly resistant to corrosion during tests, epoxy coated rebar tie wire will only perform as designed if it is handled with extreme care and diligence. But the reality is that during packaging and handling, knicks and burs the size of pin holes will form in the epoxy coating, which will let moisture seap inside and corrode the metal from underneath. The corrosion can spread into areas where the epoxy coating remains intact, making it harder to diagnose the areas that need repair. There are other options these days for corrosion-resistant rebar tie wire. Various gauge galvanized, stainless steel, and black annealed steel rebar tie wire are available for a number of different building applications. While epoxy coated rebar tie wire might not be banned in your area, you might want to consider other options for long term structural stability.