A Two-Pack Waterborne Polyurethane Topcoat for Military Aircraft

By Christopher J. Lyons

A waterborne two-pack polyurethane finish coating formulated for military aircraft provides extended durability performance suited for Australia’s harsh climate as well as substantial reductions in content of volatile organic compounds when compared with high-solids solvent-based aerospace coatings.

A formulating practice using commercially available hydroxyl-functional polyurethane dispersions combined with hydrophilically modified polyisocyanate resins enables compositions to be made that are suitable for spray application, have drying properties useful for aircraft workers, and cure to form films with the specified resistance and flexibility properties.