Publisher Summary The surfaces of most components that have been worn, corroded, or mismachined can be built up by depositing new material on the surface. The new material may be applied by many different processes that include weld deposition, thermal spraying, and electroplating. This chapter tabulates guidance for the choice of process. The choice of a suitable process depends on the base material and the final surface properties required. It is influenced by the size and shape of the component, the degree of surface preparation and final finishing required, and the availability of the appropriate equipment, materials, and skills.