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American WeatherStar Spray Foam Offers Waterbased Sealant for Roofing

Published on 2010-12-08. Author : SpecialChem

American WeatherStar Spray Foam has manufactured Butter-Grade 221, which is a water-based, high solids elastomeric sealant utilizing the latest advances in advanced acrylic technology. Butter-Grade 221 is manufactured from a unique acrylic resin specifically designed to provide increased tensile strength and elongation on problem roof areas. Butter-Grade 221 is whipped and thicker than Brush-Grade 220.

Butter-Grade 221


  • Superior Protection - forms a durable, weather resistant "rubber-like" seal.
  • Ideal for sealing holes, cracks and joints.
  • Highly flexible.
  • 100% acrylic elastomeric caulk, fully compatible with other WeatherStar elastomeric products.
  • Superior adhesive and cohesive strength.
  • Plasticizer-free caulk, will not dry-out or become brittle.
  • Contains a strong mildewcide / fungicide.
  • Easy to use, easy clean up, non-toxic and VOC compliant water based caulk.


Butter-Grade 221 is ideally suited for sealing mechanical fasteners and vertical seams on metal roofs, as well as around flashings, drains and penetrations on most roof surfaces. It has excellent adhesion to asphaltic roofing, metal, concrete, wood, and polyurethane. Other surfaces should be checked for adhesion.


All surfaces to be coated must be cleaned properly. Power washing is recommended. Any existing coating must be checked for good adhesion. Before application, any loosely adhered coating must be removed and bare surfaces must be prepared, cleaned and checked for compatibility.

Butter-Grade 221 is ready to use. Thinning is not required or recommended. Apply with a good quality synthetic bristle brush.

About American WeatherStar Spray Foam

American WeatherStar Spray Foam Division offers a complete line of spray polyurethane foam (SPF) that is designed to perform in both roofing and wall applications. When used as a roof coating, SPF is then topcoated with one of our durable roof coatings to make a reflective white roofing system with a great insulation R-value. AWS SPF makes a solid base for weather resistant roofing, but it can also be used to insulate and protect walls and other industrial surfaces. American Weatherstar has always believed in offering the customers best waterproof and most energy efficeint roofing, and the spray foam insulation products prevent leaks and save energy dollars. The Spray Foam division takes roof and wall coatings products line to a whole new level of insulation performance and energy savings.

Source: American WeatherStar Spray Foam

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