Geothermal process equipment is insulated to maximize energy extraction efficiency and to prevent heat loss to the environment. Insulated exterior metal surface may experience corrosion at elevated temperatures as a result of natural moisture ingress. Additionally, if brine leaks through valves, flanges or other connections, corrosion under insulation, CUI, may be exacerbated. Examples of CUI and corrosion mitigation efforts in the geothermal industry are provided. Keywords: Carbon steel corrosion, stainless steel corrosion, geothermal brine, insulation, spray coatings, fabric coatings, silicone binder, boron, CUI.