CRL 777 butyl rubber sealant consists of a butyl based polymer formula that repels weather extremes and will last for many years. When CRL 777 sealant is applied to a clean surface, this butyl caulk offers excellent adhesion and will hold up to joint movement +/-10% without affecting its sealing ability and resistance to water penetration. CRL 777 butyl sealant contains a unique ultraviolet fighting agent which provides outstanding longevity. CRL 777 butyl sealant is recommended for exterior applications and provides an excellent contact with wood, masonry, metal surfaces and glass. Applications in hidden areas around sills, thresholds, screw heads, between metal panels, wall mounted air conditioners, and beneath aluminum siding. soffit, facia and gutters, to name a few, are all excellent locations for butyl rubber sealants. Apply in temperatures between 0° to 120° F. The service temperature range is between -20° to 200° F. CRL 777 butyl rubber sealant offers excellent adhesion to all clean surfaces and will withstand joint movement of +10% without affecting its water tightness. Also, it has a special U.V. fighting agent for exceptional service life.
for areas under screw heads, still cans, thresholds, aluminum siding and gutters
for areas between metal building panels and wall-mounted air conditioning units
not intended for use in window glazing applications with insulated glass units, or hidden joint details that require a non-skinning, non-hardening sealant.
not intended for use in sealing horizontal decks, patios, driveways or terrace joints where abrasion or physical abuse is encountered.
not intended for interior or exterior structural sealing below the waterline in marine applications.
nor recommended for surfaces with special protective or cosmetic coatings without prior consultation of the manufacturers. Such surfaces include, but are not limited to, mirrors, reflective glass, surfaces coated, polyethylene or polypropylene.
should not be applied with wet tooling techniques using solvents; water or detergent/soap solutions is not recommended.
should not be applied to unpredictably absorptive surfaces such as marble, limestone, or granite unless a standard of appearance has been agreed on as a result of testing for stain and/or discoloration.