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.

ADVANTAGES

• 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.

BASIC USES

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.

INSTALLATION

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.