APPLICATION Apply CRL M66 using a professional sealant gun loaded at the job site. CRL M66 maintains excellent gunnability over a broad temperature range. Joint should be filled from bottom up. Proper size nozzle and gun angle are extremely important when applying sealant to assist in the wetting out process. Install back-up material or joint filler, spacer shims and tapes as specified.Apply CRL M66 in a continuous operation using a positive pressure adequate to properly fill and seal the joint. Tool the sealant with adequate pressure to spread the sealant against the back-up material and onto the joint surfaces. A tool with a concave profile is recommended to keep the sealant within the joint. Excess sealant should be dry-wiped from all surfaces while still uncured, following with a commercial solvent such as mineral spirits, or isopropyl alcohol. Should CRL M66 accidentally begin to cure on adjacent porous surfaces, the excess sealant should be allowed to progress through the initial cure or set-up. It should be then removed promptly by abrasion or other mechanical means.
When stored at or below 80°F (27°C), CRL M66 Modified Polyurethane has a shelf life of one year from date of manufacture.
No maintenance should be needed. If sealant becomes damaged, replace damaged portion. Clean surfaces in damaged area and repair with fresh CRL M66 Modified Polyurethane Construction Sealant.
9 standard colors and 23 CRL/U.S.Aluminum special colors. Custom colors available upon request.
Complete technical information and literature is available from C.R. Laurence Co., Inc. Any technical advice furnished by the company or any representative of the company concerning any use or application of any sealant is believed to be reliable, but the company makes no warranty, expressed or implied, for any use or application for which such advice is furnished.
Moisture on substrates will adversely affect adhesion and can be found at temperatures below 40ºF (4ºC). Methyl etheyl ketone (MEK) is soluble in water and may be more appropriate for winter cleaning as it helps in removing con- densation and frost. CRL M66 Modified Polyurethane Construction Sealant maintains excellent gunnability over a broad temperature range. At 75ºF (23ºC), 50% Relative Humidity, a durable skin forms in 30 minutes. Curing continues at the rate of 1/8 inch (3 mm) depth per day. The cure rate is reduced at lower temperatures and less humidity. After a complete cure, all chemical components of M66 can be considered inert.
Immediately after use and before sealant has cured, equipment must be cleaned with mineral spirits, or isopropyl alcohol. The cured sealant may be removed by cutting with sharp-edged tool; thin films removed by abrading.
LIMITED WARRANTY NOTICE
CRL and its manufacturer warrant our products to be of good quality and will replace or, at our election, refund the purchase price of any products proved defective. Satisfactory results depend not only upon quality products but also upon many factors beyond our control in the application process. Therefore, except for such replacement or refund CRL and its manufacturers make no warranty or guarantee, expressed or implied, including warranties of fitness or merchantability, respecting its products. CRL and its manufacturers shall have no other liability with respect thereto. User shall determine the suitability of the product for his intended use and assume all risks and liability in connection therewith. Any authorized change in the printed recommendations concerning the use of our products must bear the signature of the CRL Product Manager.
CURED SEALANT IS USUALLY VERY DIFFICULT TO REMOVE WITHOUT ALTERING OR DAMAGING THE SURFACE TO WHICH THE SEALANT HAS BEEN MISAPPLIED.
CRL M66 Modified Polyurethane Sealant is packaged in 10.1 oz. (300 ml) cartridges, 30/case, and 20 fl. oz. (600 ml) sausages (15/case). Also available upon request are 2 and 5 gallon pails.
Uncured sealant may irritate the eyes. Avoid contact with eyes and skin. Contact lens wearers take appropriate precautions. IN CASE OF CONTACT, FLUSH EYES WITH WATER, CALL A PHYSICIAN. Remove from skin with dry cloth or paper towel. KEEP OUT OF THE REACH OF CHILDREN. REFER TO MATERIAL SAFETY DATA SHEET FOR FURTHER INFORMATION.
Materials submitted for testing should be sent to: C.R. Laurence Co., Inc. Technical Sales Department PO Box 58923 Los Angeles, CA 90058-0923
This program is intended to eliminate potential field prob- lems by pretesting CRL construction sealants with samples of the building materials on which the sealant will be applied. The test will aid in determining the proper surface prepara- tion method, effective solvents for cleaning and whether priming is necessary to achieve optimum adhesion. Following this procedure will remove many of the unknown variables which affect field success.
Test samples of substrates should be identified as to manufacturer, origin, designed use, building project, person and firm originating the request. Appropriate sketches or drawings showing the intended use can be helpful.
C.R. LAURENCE CO., INC. • CORPORATE HEADQUARTERS: POST OFFICE BOX 58923, LOS ANGELES, CA 90058-0923
TOLL FREE TELEPHONE (800) 421-6144 • TOLL FREE FAX (800) 262-3299 crlaurence.com