CRL Gray M64 Modified Polyurethane Construction Sealant - Cartridge

CRL Gray M64 Modified Polyurethane Construction Sealant - Cartridge

  • AAMA Approved
  • img src="/siteimages/buttons/leed.gif" border="0" align="center">
  • One-Part Smooth Finish Formula With Primerless Adhesion on Most Common Construction Surfaces Including Kynar™ Coated Metals
  • UV Resistant/Non-Yellowing
  • VOC Compliant - Only 9 g/L
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$8.64 /each


In stock
Ships same day


Case Qty




Contents of Cartridge

10.1 fl oz (300 ml)

Minimum Order

1 Each

Sealant Requirement Estimator Chart

Shipping Weight

1 lb (454g)

Shelf Life

12 Months

Pallet Quantity


  • 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
  • Sealant Estimator Chart

CRL M64 is a one-part, moisture curing, gun grade modified polyurethane sealant. It does not require a primer on most common construction surfaces. CRL M64 is durable, flexible, and offers excellent performance in moving joints.

Basic Uses
CRL M64 Modified Polyurethane Construction Sealant is specially formulated to outperform traditional VOC solvent polyurethanes for sealing moving joints in concrete, masonry, metal, and other basic perimeter joint applications. It is ideal for all joints between framing (door and window) and the building structure in both storefront and curtain wall applications to secure a watertight installation. This advanced polymer formula offers excellent adhesion to fluoropolymer paint coatings for metal surfaces including Kynar™, Duranar®, and Duranar® Sunstorm™ Coatings, as well as standard metal, aluminum, steel, galvanized steel, plastics, vinyl, glass, wood, concrete, brass, and other common building substrates.

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

It is also suitable for varied manufacturing uses, such as the production of travel trailers and mobile homes, and in the assembly of galvanized air conditioning ductwork.

Exceptional adhesion to Kynar™ coated metals.
VOC Compliant – only 9 g/L (Chemically curing < 3%).
Eco-Friendly Product – Solvent-Free, Isocyanate-Free, VOC Compliant, Qualifies for LEED Credit for Section EQ (Indoor Environmental Air Quality).
Low temperature gunning and application above 0°F (18°C).
Service temperature of -75°F to 300°F (-59°C to 149°C).
Permanently Flexible – Will not get hard with age like traditional polyurethanes. Remains flexible in low temperatures.
Fast Cure - Skins over in 30 minutes and continues to cure at a rate of 1/8" (3 mm) depth per day.
Tooling time – approximately 20-40 minutes, depending on temperature and humidity.
Paintable – Can be painted in only two hours with water-based paints.
UV Resistant – Will not turn yellow from exposure to the sun.

Technical Data
CRL M64 conforms to and passes:
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.
ASTM C510, ASTM C639, ASTM C661, ASTM C679, ASTM C717, ASTM C719, ASTM C793, ASTM C794, ASTM C1183, ASTM C1193, ASTM C1246, ASTM D412, ASTM D624, and ASTM G155.
CAN/CGSB-19, 13-M87, Type MCG-2-25-A-N, QPL # 81026.
AAMA 808.3-92 Exterior Perimeter, AAMA 802.3-92 Type II Ductile Back Bedding Compound.
USDA approved for use in meat and poultry areas.
Meets California Air Resources Board 2003 requirements for Volatile Organic Compound (VOC) content. Qualifies for LEED® (Leadership in Energy and Environmental Design) Green Building Rating System™ credit.

Do not apply over damp or contaminated surfaces. Use with adequate ventilation. Not recommended for surfaces with special protective or cosmetic coatings without prior consultation of the manufacturer. Should not be applied to mirrors or unpredictable 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. Check cartridge label, MSDS, and Specification Data Sheet for additional limitations.

Comparable Sealants
CRL: M66 Modified Polyurethane Sealant, M65W PermaWhite. Tremco®: Vulkem® 116, Vulkem 921, DyMonic®, Dymonic® FC, TremGlaze U1400, TremPro 626. Sika®: 1A, 15LM. Sonneborn®: NP1. Pecora®: Dynatrol 1. OSI®: PR-255. Schnee Moorehead: 7100 Sealant. Bostik: Chem-Caulk 900.
Important Notes
Do not apply over damp or contaminated surfaces. Use with adequate ventilation. Not recommended for surfaces with special protective or cosmetic coatings without prior consultation of the manufacturer. Should not be applied to mirrors or 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. Check cartridge label and Specification Data Sheet for additional limitations.

CRL Catalog crl83r #803 (pdf)

CRL Catalog crl03 #47 (pdf)

CRL Catalog crl93g #414 (pdf)

Spec (pdf)

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Shipping Policy

Our main office and largest warehouse located in South Florida, but we also have several shipping warehouses throughout United States.  It enables us to deliver orders to our customers as fast as possible at discounted rates.

Our Shipping Locations:

Miami, Florida
Orlando, Florida
Los Angeles, California
San Diego, California
San Francisco/Oakland (Union City), California
Atlanta, Georgia
Boston (Taunton), Massachusetts
Chicago (Elgin), Illinois
Cicero, Illinois
Cleveland (Solon), Ohio
Dallas, Texas
Denver, Colorado
Houston, Texas
Las Vegas, Nevada
New York Area (Secaucus, New Jersey)
Philadelphia Area (Moorestown, New Jersey)
Phoenix, Arizona
Seattle (Kent), Washington


We offer Standard (UPS or USPS) and Express (UPS Overnight) shipping options. Each option offers a different delivery date. However, all options require time to process the order before shipping. We pride ourselves on fast shipping and will make our best to ship your item within 48 hours. For larger orders, we might be able to have the item(s) shipped via common carrier.


We do ship to APO/FPO addresses. You must select "Standard Shipping” during the Checkout process.


We calculate shipping charges by the weight and size of the item. To determine your shipping costs for an item(s), simply add the item to the Shopping Cart. The shipping charges will be displayed in the Shopping Cart before any credit card information is required. Don't worry about adding items to the Shopping Cart - you can remove them at any time.

Please be informed that $4.99 packaging and handling fee will be added to the orders that are less than $50.00. If your product requires cutting, $7.00 cut cutting fee will be added to the items that require cutting.

Long items will cost more to ship than the quoted price and shipping fee will be adjusted accordingly to reflect the actual shipping price charged by the courier. Reason: long items are shipping according to dimensional weight instead of actual weight of the product

Return Policy

We accept returns up to 30 days


Receiving agent (Customer) must communicate with DK Hardware Supply within 3 days of receiving the order for us to process shipping damage claim with respective carrier in timely matter.

All shipments shall be checked thoroughly for damage at receiving before accepting and especially before signing on the carrier's delivery paperwork.

Upon freight shipment being signed for acceptance, it becomes a binding document as to the condition of the products on delivery. We cannot process any shipping damage claim if you accept the delivery by signing such documents.

If a damage is found at delivery, both you and the delivery driver must make notes on BOL or other paperwork detailing the found damage, description of damage, time/date, your name, contact phone, etc. on the delivery documents. Make a copy of the marked BOL or any other documents presented by carrier.

If refusal of the shipment is needed due to severe damage, DO NOT sign the delivery carrier's BOL document indicating that you accept the delivery and/or just refuse the package.

Take pictures showing the damage before the delivery driver leaves. Contact DK Hardware Supply reporting the damage by forwarding the marked BOL copy, any other documents and pictures.

The RMA process – four easy steps

1. Create an RA number.

Your product must be returned with an RA (Return Authorization) number so we can identify it. You can obtain an RA number by either calling 877-509-8040 or 1-954-556-6667 or via email sales@dkhardware.com. All returns must be authorized by the Returns Manager & 20% - 25% restocking charge will apply to stock items. All return shipping charges have to be paid by the customer and no shipping or handling charges credit allowed. Original Shipping charges are not refundable.

2. Send the product to DK Hardware Supply.

We advise to ship your items with delivery confirmation. Please note that we are not responsible for your return shipping charges. Please ship the merchandise to:

DK Hardware Supply
RMA# _________
208 NW 6th Ave
Hallandale Beach, FL 33009
3. Your RMA is received and approved.

Please allow 3-5 business days from the time we receive your shipment to review and approve your RA. If you would like to know the status of your RA, it is best to email sales@dkhardware.com or call.

4. Refund.

Once your RA is received at our warehouse and approved, please allow 3-5 business days for the refund to appear on your account. In rare circumstances, the returned product will require manufacturer’s inspection and delay RMA approval. We will contact you in case there is a delay.

Please note special conditions for returned merchandise and non-returnable items:

We charge the restocking fee to encourage customers to purchase products they intend to keep. Items returned up to 14 days are subject to 20% restocking fee. Items returned between 14-30 days are subject to 25% restocking fee.

Power tools, including but not limited to electric, pneumatic and mechanic may not be returned for credit or refund. Power tools are guaranteed by their manufacturers, and any returns for credit due to manufacturing defects or workmanship should be handled through the warranty department of the tool's manufacturer. You can find the manufacturer contact information in your product manual, in the item listing, on the manufacturer's website or it can be obtained by calling us or email to sales@dkhardware.com.

Wood's™ Products including but not limited to Ladder Lifters, Lift Arms, Lift Frames , Tilters, rotators and Adaptation Device are not returnable and considered a "Final Sale" as they are considered special order items. Orders that include these items cannot be canceled once this order/quote has been Processed

Custom made Items, Cut materials, Altered therefore not a stock item, large volume orders, specially priced items, Special quoted items, special order items are considered a "FINAL SALE" and these items cannot be returned or canceled once this order/quote has been Processed.

No returns are accepted for the custom made orders or product which shelf’s life has expired. All returned products will be thoroughly inspected and a determination will be made if eligibility and conforming requirements are met. Please verify the product you are returning meets the below guidelines and qualifies for return to avoid any delay in, or denial of, processing your return.

Product Inspection Criteria

Products that are labeled with a security seal must have the seal intact and not tampered with.

Products must be in the original manufacturers packaging and shipped securely.

Products must be complete with any standard certification labels (UL listing, capacity, brand name, UPC code) originally placed and not tampered with.

Products must be free from damage of any type, including, but not limited to dents, scratches, cracks, abuse, defacement or indication of removed screws/fasteners or seals.

Product serial number, or any similar identification numbers, must match the serial number on the package or invoice (DK Hardware Supply maintains serial number tracking).