Thermal spray technology comprises a group ofcoating application processes which provides sur-faces protection functions and performance enhancementof substrate or component. Thereare several types and forms of materials that canbe sprayed thermally to provide them protectionagainst corrosion, wear, and also it serves as a thermalbarrier. This technique is also used to restoreand repair parts or components, not to mention avariety of applications. This article attempts to bea reference guide of thermal spray technology, coveringthe technical principles, mechanisms of layerformation and adhesion of the coating / substrate,processes, types of coatings, applications andanalyzing a case of study.