A monolayer or a few atomic layer thick graphene coatings on metals has been shown to improve corrosion resistance by up to two orders of magnitude. However, there are considerable variability in the literature on the degree of improvement. For example, improvement in aqueous corrosion resistance of copper due to graphene coating is reported to vary from insignificant to two orders of magnitude. In fact, some of the reports have shown graphene coating to deteriorate long-term corrosion resistance of copper (i.e., graphene-coated copper having much inferior corrosion resistance). On the other hand, the recent studies from the prsenter’s group has demonstrated durable corrosion resistance due to graphene coating. While reasons for such variability will be discussed, this presentation will also discuss the challenges in the possible application of the disruptive approach of graphene coating for corrosion resistance of most common engineering alloys, i.e., steels.