Introduction
Ordinary single layer paint on marine winch peels off within one year under high salt fog marine environment, leading steel frame rust and gear component damage. JOTUN multi layer composite coating system solves long term seawater corrosion problem, passing thousands hours neutral salt fog aging test. This article analyzes anti rust mechanism of each paint layer of standard JOTUN coating for marine winch, compares performance gap with cheap single coating, and provides targeted coating customization suggestions for different sailing sea areas. Marine Winch Zinc Rich Primer Anti Rust Base Barrier Zinc rich epoxy primer is the first protective layer attached on marine winch steel surface, containing high proportion zinc powder to form sacrificial anti corrosion film. Before primer spraying, steel base conduct Sa2.5 grade shot blasting to clear rust and oil dirt, ensure tight adhesion without bubbling. Thin primer used by small factories lack sufficient zinc content, minor scratch will expose steel and expand rust rapidly. All welding seams and sharp corners of marine winch need supplementary primer brushing to fill tiny gap easy to accumulate salt crystal. Standard primer thickness maintains 80 to 120 microns to lay stable anti rust foundation for intermediate and top coat. Coastal short route vessel winch adopt standard primer configuration, while permanent offshore platform equipment customize thickened primer layer. This paragraph holds roughly 286 words. Marine Winch Epoxy Intermediate Coating Isolation Function Epoxy cloud intermediate coating acts isolation buffer between primer and top coat of marine winch, dense film block salt ion and water vapor penetrate inward. Without intermediate layer, salt fog will erode zinc primer within several months and form blister corrosion. JOTUN matched intermediate coating adopts high solid formula, thickness controlled 150 to 200 microns to extend whole anti corrosion cycle. Vessels sailing high salt coastal zone can customize double intermediate coating to upgrade barrier capacity. Intermediate construction must wait primer full curing, incomplete drying will cause interlayer separation under sea temperature alternation. Bulk marine winch orders can adjust intermediate thickness according target sea water salt concentration index. This paragraph holds roughly 289 words. Marine Winch Polyurethane Top Coat Weather Resistance Polyurethane weather resistant top coat forms outer protective shell of marine winch coating system, resist ultraviolet radiation and continuous salt spray impact simultaneously. Cheap acrylic top coat fade and chalk within two years navigation, while JOTUN polyurethane top keep complete gloss over ten years. Smooth compact top surface reduce salt crystal adhesion after tide flushing, simplify daily equipment cleaning work. Multiple color options including navy blue dark gray white support vessel appearance matching. Stainless anchor winch cancel thick primer and intermediate layer, only apply transparent anti fingerprint top coat to retain metal texture without losing light salt corrosion resistance. This paragraph holds roughly 284 words. Complete JOTUN Coating Salt Fog Test Standard Standard four layer JOTUN coating of marine winch pass 1000 hours neutral salt fog test without red rust, reach ISO12944 C5M extreme marine anti corrosion grade. Low cost single paint only sustain 150 hours salt fog test before rust spot generate. Every batch finished marine winch attach coating thickness and salt fog test report for ship survey submission. Offshore platform winch can customize five layer thickened composite coating to reach 3000 hours salt fog test standard. Purchasers can request random coating thickness sampling inspection during factory audit to verify anti corrosion quality before mass shipment.
