my seasoning flaked off and it became metallic appearance. I was struggling with obtaining stable seasoning, but found a reddit post that suggesting Blueing process. You heat-up your clean wok a lot with no-oil the iron reacts with oxygen to form magnetite Fe3O4 which holds seasoning much better. After you blue your wok, you season it by heating up some oil, but generally it seasons itself diring usage. If something starts sticking, more oil and more heat usually does the job.