CRL Redwood Grain Textured Polyurethane Construction Sealant Cartridge

• One-part, grainy textured modified polyurethane sealant 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 M66 (SKU: M66RW) is a one-part, moisture-curing, gun-grade modified polyurethane construction sealant formulated for moving joints. It typically requires no primer on common substrates and delivers durable, permanently flexible performance for exterior and interior perimeter and storefront/curtain wall joints.

Basic Uses: CRL M66 is designed for sealing moving joints in concrete, masonry, metal, and perimeter applications between framing (doors and windows) and the building structure. The advanced polymer formulation adheres to fluoropolymer paint coatings (KYNAR®, Duranar®, Duranar® Sunstorm™), standard metals (aluminum, steel, galvanized steel), plastics, vinyl, glass, wood, brass, and concrete. Compatible with insulating glass sealants when used as a toe or heel bead. Withstands -75°F to 300°F (-59°C to 149°C) after full cure. Paintable after two hours with water-based paints.

The light grainy texture blends with textured substrates such as stucco and masonry and hides tooling marks on smooth metal storefront joints. Also suitable for manufacturing applications including travel trailers, mobile homes, and galvanized HVAC ductwork assembly.

Features & Differentiators:

• Exceptional adhesion to KYNAR®-coated metals — ideal long-term sealant for metal storefronts and curtain walls
• Low-VOC, solvent-free, isocyanate-free formula — only 9 g/L, qualifies for LEED EQ (Indoor Environmental Quality) credit
• Fast curing: skins over ~30 minutes; cures ~1/8" (3 mm) per day
• Permanently flexible — resists hardening with age and stays flexible at low temperatures
• Low-temperature gunning and application above 0°F (-18°C)
• Paintable with water-based paints in as little as two hours
• UV resistant — resists yellowing from sun exposure

Technical Data
Conforms to Federal Specification TT-S-00230C, Type II, Class A; ASTM C920-98, Type S, Grade NS, Class 25, Use NT, M, T, A, G, and O. Also tested to ASTM C510, C639, C661, C679, C717, C719, C793, C794, C1183, C1193, C1246, D412, D624, G155. CAN/CGSB-19,13-M87 Type MCG-2-25-A-N QPL #81026.