Archco 381 Delivers High Gloss and Lasting Protection for Industrial and Marine Assets

Archco 381 is a high-gloss, hybrid exterior topcoat developed to provide outstanding protection and visual appeal for a wide range of industrial and marine assets. This high-solids, two-part coating is specifically designed to incorporate the best characteristics of polyurethane coatings, including high gloss, exterior durability, chemical resistance, solvent resistance, mar resistance, and flexibility. Uniquely, Archco 381 achieves these results while being completely isocyanate-free and offering excellent gloss retention, making it a standout solution for asset protection in challenging environments.

Versatile Applications

Archco 381 is engineered for use on storage tanks, offshore and marine structures, structural steel, railcar exteriors, aboveground pipelines, and for general industrial maintenance. It is also suited as a topcoat for Protal and Archco coatings. Its versatility allows it to be used both in new construction and in maintenance projects, providing reliable protection and a high-quality finish across multiple sectors.

Key Features and Performance

One of the primary advantages of Archco 381 is its isocyanate-free formulation, which enhances safety during application and use. The coating can be applied in a single coat to properly prepared, previously painted surfaces, or it can be used direct-to-metal, streamlining the application process and reducing labor time. Archco 381 delivers excellent gloss and color retention, ensuring that coated surfaces maintain their appearance even after prolonged exposure to harsh conditions. It’s good corrosion and chemical resistance further extend the life of critical infrastructure, and its excellent recoat properties provide flexibility for ongoing maintenance needs.

Surface Preparation and Application

Proper surface preparation is essential for maximizing the performance and durability of Archco 381. Surfaces should be at least 40°F (4°C) prior to application, dry, clean, and free of oil, grease, and other contaminants. For direct-to-metal or existing substrates, a pressure wash is recommended. For optimal adhesion, it is advised to prime with Archco 300 Primer at a dry film thickness of 4 to 8 mils.

Archco 381 is supplied as a two-part kit and should be thoroughly mixed with a power agitator before use. Application can be performed by roller, brush, or airless spray, with the coating typically applied at a film thickness of 10 to 12 mils wet (6 to 8 mils dry) in a single coat. The pot life at 77°F (25°C) is four hours, and equipment should be cleaned with MIBK or MEK after application.

Storage and Safety

For best results, Archco 381 should be stored in original, unopened containers in a dry, well-ventilated area between 40°F and 90°F (4°C and 32°C). The shelf life is at least twelve months under these conditions. It is recommended to bring all components to between 68°F and 86°F (20°C and 30°C) for 24 hours prior to use to ensure optimum pumping and productivity. During application, wear protective clothing and ensure adequate ventilation to avoid contact with skin and eyes.

Why Archco 381 Is the Smart Choice for Your Next Project

When it comes to protecting your most valuable assets, Archco 381 brings together the best of both worlds: striking high-gloss aesthetics and the rugged performance needed for harsh industrial and marine environments. Its isocyanate-free formula, straightforward application, and proven durability make it a go-to solution for maintenance teams and asset owners who want a coating that looks great and performs even better. If you are ready to upgrade your protective coatings, Archco 381 is ready to deliver the results you need.