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Several projects within COST-50-II were concerned with evaluating corrosion behaviour of coatings applied on some most widely used substrates. Although different technique and evaluation criteria were employed considerable information on relative protective properties of coatings has been compiled. Significant requirements put on the coatings i.e. the corrosion resistance, the effect on mechanical properties, and the coating/substrate stability are reviewed in the light of protective potential of the coatings. Performance evaluation of selected coatings applied on different types of turbine blades encompassing operating conditions prevalent in modern aircraft engines has enabled to establish their merits. On turbine blades coating renewal criteria is covered briefly.