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One-Part Smooth Finish Formula with Primerless Adhesion on Most Common Construction Surfaces +100% to -50% Joint Movement Capability CRL M64 Polyurethane is a high performance, low modulus, one-component, moisture curing modified polyurethane sealant. It has a smooth, even consistency and surface when cured. M64 requires no priming for common substrates such as brick, concrete, aluminum, wood and granite. It applies with any standard cartridge caulking gun to clean, dry surfaces. M64 was specifically developed for sealing dynamically moving joints, such as: expansion and control joints, precast concrete panel joints, curtainwall joints, perimeter caulking (masonry, windows, doors, panels), bedding of mullions, panels and frames. It is compatible with I.G. sealants when glazing units and applied as a toe or heel bead. M64 exhibits tenacious adhesion which will not dissipate with time. This unique weather-resistant formulation possesses a balanced adhesive strength, low modulus and high recovery, making it ideal to withstand the following adverse conditions common to such installations: moisture, movement, shear and deflection. M64 is suitable for continual immersion in water with the use of the appropriate primer. Paintable after full cure, minimum 72 hours. In order to help you better select the correct sealant, we have put together a Silicone and Sealant Selector Chart . Color: Off-White Contents of Cartridge: 10.1 fl oz (300 ml) Minimum Order: 1 Each Technical Data : Conforms to U.S. Federal Specification TT-S-00230C, Type II, Class A; ASTM C920-98, Type S, Grade NS, Class 25, Use NT, M, T, A, and O. CAN/CGSB 19, 13-M87, Type MCG-225-A-N with QPL #81050. USDA Approved Comparable Sealants : CRL M66 Polyurethane; Tremco Vulkem 921, Tremco Vulkem 116, Tremco Vulkem 911, Tremco Vulkem 931, Tremco DyMonic; Sika 1A, Sika 15LM; Sonneborn NP1, Sonneborn Sonolastic 150; Pecora Dynatrol 1; OSI