Integrated thermal insulation and anti-corrosion coatings, which achieve heat reduction and corrosion protection in one layer, attract wide application on tank exteriors and steel roofs thanks to simplified construction. Nevertheless, industrial research indicates lower coating surface temperature cannot guarantee upgraded anti-corrosion performance, and insulation and barrier properties should be assessed independently. Insulation fillers reduce operating temperature and slow corrosion reactions and resin ageing. Still, hollow glass beads, aerogel and other fillers create new organic‑inorganic interfaces. Poor filler wetting, agglomeration or excessive loading easily form micropores, enabling corrosive media penetration. The benefits brought by temperature drop may be offset by reduced coating compactness. Standard controlled testing is recommended: pure anti-corrosion coatings serve as references under identical conditions. EIS monitors long-term barrier performance, wet adhesion is evaluated, and interfacial micro-defects after thermal cycling are inspected. Surface modification and optimized PVC help balance performance once degradation occurs. Studies confirm insulation and anti-corrosion do not naturally cooperate, and full tests are essential to validate formulations. For more information, please visit：https://v.douyin.com/cqWECsXikiE