Polyurethane coatings can be both one- component (moisture cured) or two-component. Here we will deal with two-component paints only. Two-component polyurethanes are among the most versatile coating types. They fill a vital niche for high-performance applications over metal, concrete, wood and plastic. Polyurethanes are mainly used as topcoats in an epoxy paint systems.

These coatings show excellent colour and gloss retention for outdoor exposures. In addition, they are resistant to chemicals and solvents. Polyurethanes are chemically curing paints and as such the curing process will depend on the temperature. The lower temperature limit is normally 0^oC.

An alternative to the Isocyanate cured polyurethane coatings is the epoxy acrylic or acrylic - acrylic type. Such curing acrylics have the same characteristics as the polyurethanes. The pot life is much longer, the drying time very short, but the curing time is somewhat longer.

• Very good weather resistance
• Excellent gloss durability
• Very good chemical resistance
• Very good solvent resistance
• Cures down to 0^oC

• Two-component
• May cause skin irritation

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