CRL M64 Bronze Modified Polyurethane Construction Sealant Sausage

• One-part smooth finish formula with primerless adhesion on most common construction surfaces including KYNAR® coated metals
• AAMA approved
• VOC compliant — only 9 g/L
• UV resistant / non-yellowing

CRL M64 (SKU: M64SBRZ) is a one-part, moisture-curing, gun-grade modified polyurethane construction sealant formulated for durable, flexible performance in moving joints. It offers primerless adhesion on most common substrates and strong compatibility with fluoropolymer metal coatings such as KYNAR®—making it an ideal KYNAR coated metal sealant for storefronts, curtain walls, and perimeter joint applications.


Basic Uses
CRL M64 Modified Polyurethane Construction Sealant is engineered to outperform traditional solvent polyurethanes for sealing dynamic joints in concrete, masonry, metal, and typical perimeter joint conditions. Use as a perimeter sealant between framing (doors and windows) and building structure for watertight storefront and curtain wall installations. The advanced polymer formula adheres to KYNAR®, Duranar®, Duranar® Sunstorm™ coatings, standard metals (aluminum, steel, galvanized steel), plastics, vinyl, glass, wood, concrete, brass, and other common building substrates.

CRL M64 is compatible with insulating glass sealants when used as a toe or heel bead. It is formulated for exterior and interior use and withstands service temperatures after full cure from -75°F to 300°F (-59 to 149°C). Paintable with water-based paints after only two hours.

Also suitable for manufacturing applications such as travel trailers, mobile homes, and assembly of galvanized HVAC ductwork.

FEATURES
Exceptional adhesion to KYNAR® coated metals.
Low-VOC polyurethane sealant — only 9 g/L (chemically curing < 3%).
Eco-friendly: solvent-free, isocyanate-free, VOC compliant; qualifies for LEED credit (EQ Indoor Environmental Air Quality).
Low-temperature gunning and application above 0°F (-18°C).
Service temperature range: -75°F to 300°F (-59°C to 149°C).
Permanently flexible — resists hardening with age and remains flexible at low temperatures.
Fast cure: skins over in ~30 minutes; cures ~1/8" (3 mm) per day.
Tooling time approximately 20–40 minutes depending on temperature and humidity.
Paintable with water-based paints after two hours.
UV resistant — will not yellow from sun exposure.

Technical Data
CRL M64 conforms to and passes Federal Specification TT-S-00230C, Type II, Class A and ASTM C920-98