Surface texturing has been widely used during recent decades. Engineering coatings are also being developed to improve the service life of workpieces. In this study, flame spraying process was used to coat aluminum on the steel substrate and the effect of micro-dimple, formed by a particular rolling apparatus, on the adhesion strength of substrate-coating was studied. In other words, surface texturing technique was used to increase surface roughness, and thereby improve mechanical bond and adhesion of coating to the substrate. The forming tool resembles a circular saw blade that indents into the workpiece and forms a pyramid with rectangular cross-section with approximate size of 140×400 µm and depth of 60 µm. Four series of tests were designed step-by-step in order to achieve a suitable size for the dimples, surface density of dimples, and to select the suitable criterion for adhesion. The specimens were textured using the micro-dimple rolling apparatus and then polished at different polishing times. The indentation of tool into workpiece creates bumps around the dimples. The effect of bumps on the adhesion strength wes investigated by texturing some specimens in one-direction and the others in two-directions. In one-direction texturing, the dimples are formed only when the tool moves forward while in two-directions texturing the dimples are also formed when the tool moves backward. In order to increase the surface density of dimples, some specimen were rotated 45 0 and/or 90 0 after the initial texturing and were textured again. The effect of indentation angle relative to the surface normal wes studied by tilting the specimen. After surface texturing, the samples were coated using the flame spraying process. The elapsed time from the start of spraying to the first observation of delamination was used as a measure of adhesion quality. The results showed that the dimples improved the adhesion strength of the coating-substrate and the greater the surface density of dimples, the better the adhesion quality of coating to the substrate. Keywords: Surface Texture, Micro dimples, Forming, Adhesion, Coating, Surface roughness.