PPG SigmaTherm 540Description One component, heat resistant, moisture curing silicone aluminum Principal Characteristics Dry heat resistance up to 600C (1112F) No heat cure necessary between coats To be used for the internal and external protection of steel surfaces Excellent resistance against weathering Also suitable on top of zinc silicate primer A minimum drying time of 3 days at 20C (68F) should be allowed before exposure to heat Complies with NACE SP0198 for
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