Pump impellers suffer from erosion especially impellers in sea water service. They are considered to be a very expensive item with long delivery lead times. Eroded and corroded impellers which are considered scrap can be rebuild and refurbished extending the life expectancy of the impeller well beyond its original service life. Once again engineering capabilities play an important role since the coated impeller is machined to return to its original tolerances and required dimensions to acheive maximum results for the efficiency of the component.