ALSAN Coating AC 401 is a VOC compliant, high quality, single component, plasticizer-free, water-based, acrylic elastomeric roof coating and protective barrier for a variety of low slope roof surfaces and substrates. Upon cure, ALSAN Coating AC 401 forms a durable, reflective coating that is highly flexible and resistant to natural weathering with excellent adhesion. ALSAN Coating AC 401 may be applied as a reflective coating over most sound and dry single ply, asphaltic modified bitumen, BUR, and metal roofing systems.

Product Properties

  • Material Resin
  • Technology Acrylic


ALSAN Coating AC 401 can be applied up to 24 wet mils thick in one application using single component airless spray equipment, roller or brush. Surfaces to be coated must be dry, clean, and free from dust, dirt, oil, loose granules, or peeling materials, mildew and other foreign matter. Perform an adhesion test on each surface type to ensure adequate bond can be achieved, or if a primer or other specific surface preparation is required. Assure ambient and substrate temperatures remain 50°F (10°C) or above, and will not fall below 32°F (0°C) within 24-hours of application, to assure proper application and curing. Application is not recommended if rain or dew is likely to occur before product dries. Prior to application, refer to published specifications, guidelines and recommendations for complete application instructions. The applicator is responsible for ensuring conditions are appropriate to proceed with proper application methods.

Please refer to the SOPREMA Roof Coatings Technical Manual for additional application guidelines.


Testing & Approvals

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Related Projects

Helen Schuler Nature Centre – Lethbridge, Alberta

SOPREMA®’s SOPRANATURE® vegetated system was constructed with the goal of creating a demonstration area for delivering educational programs and providing a living classroom for visitors. “We’re honored that the Helen Schuler Nature Centre project has been recognized in North America as a representation of excellence in green roof design,” says Douglas Olson, President and CEO, O2 Planning + Design.

Placer County Water Agency – Auburn, California

In 2015, the Placer County Water Agency took on a tear-off roofing project, in which SOPREMA products were used. SOPREMA was the right choice for this project because the breadth of products met the designer’s needs, including meeting California Title 24 energy efficiency standards with the use of ENERGY STAR® rated SOPRASTAR® Flam. Another appealing aspect was the versatility of SENTINEL® P150, which allowed coverage for the vertical walls throughout the roofing system.