Walls Outdoor

A bridge to high performance

Superior exterior wall coatings with polyurethanes

A store or office with peeling paint conveys an unkept appearance. On the other hand, one with a fresh-looking coat of paint can be very inviting. With high-performance polyurethane exterior wall coatings, it’s possible to create a long-lasting, attractive appearance that is easy to clean.

exterior wall coatings
PU-based exterior wall coatings provide excellent look and durability.

Exterior wall coatings have a tough job. They must both protect and beautify despite varying weather conditions and exposure to UV radiation, pollutants and dirt. Polyurethane (PU) exterior wall coatings are the perfect solution.

Covestro offers Bayhydrol® and Bayhydur® polyurethane building blocks for the formulation of low odor, low volatile organic compound (VOC) content, high durability exterior water-based wall coatings that outperform commonly used acrylic systems. They have just the right combination of properties to protect vertical wall surfaces:


  • Excellent mechanical strength
  • Good weather stability and UV resistance
  • Superior water barrier properties
  • High resistance to chemicals and pollutants
  • Good gas diffusion properties
  • Excellent dirt pick-up resistance
  • Ease of cleaning
  • Excellent crack bridge 

Importantly, with their hard and soft segments, outdoor PU coatings are hard but have a degree of elasticity. As a result, they can bridge small cracks better than other coating systems. They are also impervious to driving rain.

With this set of high-performance properties, polyurethane coatings are the technology of choice when the long-term protection of exterior vertical surfaces is required.

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