{"id":4354,"date":"2025-08-12T11:44:15","date_gmt":"2025-08-12T18:44:15","guid":{"rendered":"https:\/\/www.accordionboot.com\/shop\/?post_type=product&#038;p=4354"},"modified":"2025-09-09T17:06:52","modified_gmt":"2025-09-10T00:06:52","slug":"black-polyurethane-construction-sealant-m64bl","status":"publish","type":"product","link":"https:\/\/www.accordionboot.com\/shop\/product\/black-polyurethane-construction-sealant-m64bl\/","title":{"rendered":"Black Polyurethane Construction Sealant \u2013 CRL M64BL (10.1 oz)"},"content":{"rendered":"<h2>Overview<\/h2>\n<p>The CRL M64BL Black Smooth Polyurethane Construction Sealant is engineered for demanding joint sealing applications in construction, glazing, and RV manufacturing. With a one-part, moisture curing formula and primerless adhesion, it delivers long-term flexibility, UV resistance, and excellent bond strength to common building substrates.<\/p>\n<h2>Key Features<\/h2>\n<ul>\n<li>Primerless adhesion on most metals, masonry, glass, wood, and plastics<\/li>\n<li>Low modulus with +100% to -50% joint movement capability<\/li>\n<li>VOC compliant at only 9 g\/L<\/li>\n<li>UV resistant and non-yellowing<\/li>\n<li>Service temperature range: -75\u00b0F to 300\u00b0F (-59\u00b0C to 149\u00b0C)<\/li>\n<li>Permanently flexible; will not harden with age<\/li>\n<li>Paintable after 2 hours (water-based paints)<\/li>\n<\/ul>\n<h2>Perfect For<\/h2>\n<ul>\n<li>Sealing perimeter joints in windows, doors, and panels<\/li>\n<li>Storefront and curtain wall applications<\/li>\n<li>RV, trailer, and mobile home construction<\/li>\n<li>Galvanized ductwork assembly<\/li>\n<\/ul>\n<p>For a weather-tight seal between your truck cab and camper or pass-through conversion, pair this sealant with our<br \/>\n<a href=\"https:\/\/www.accordionboot.com\/shop\/product\/accordion-boot-vinyl-insert-replacement-by-foot\/\">Vinyl Insert Replacement<\/a> and other <a href=\"https:\/\/www.accordionboot.com\/shop\/product-category\/rubber-boot-seal\/\">Rubber Boot Seal<\/a> products.<\/p>\n<h2>Specifications<\/h2>\n<table>\n<tbody>\n<tr>\n<td>Brand<\/td>\n<td>CRL (C.R. Laurence)<\/td>\n<\/tr>\n<tr>\n<td>Model \/ Part #<\/td>\n<td>M64BL<\/td>\n<\/tr>\n<tr>\n<td>Color<\/td>\n<td>Black<\/td>\n<\/tr>\n<tr>\n<td>Cartridge Size<\/td>\n<td>10.1 fl oz (300 ml)<\/td>\n<\/tr>\n<tr>\n<td>Weight<\/td>\n<td>~1.2 lbs<\/td>\n<\/tr>\n<tr>\n<td>Materials<\/td>\n<td>Modified Polyurethane<\/td>\n<\/tr>\n<tr>\n<td>Joint Movement<\/td>\n<td>+100% \/ -50%<\/td>\n<\/tr>\n<tr>\n<td>Service Temp<\/td>\n<td>-75\u00b0F to 300\u00b0F<\/td>\n<\/tr>\n<tr>\n<td>Standards<\/td>\n<td>ASTM C920-98, TT-S-00230C, AAMA 808.3-92, USDA Approved<\/td>\n<\/tr>\n<tr>\n<td>Shelf Life<\/td>\n<td>12 Months<\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Installation \/ Setup<\/h2>\n<ol>\n<li>Ensure surfaces are clean, dry, and free of dust or contaminants.<\/li>\n<li>Cut nozzle to desired bead size.<\/li>\n<li>Apply using a standard cartridge caulking gun.<\/li>\n<li>Tool the bead within 20\u201340 minutes.<\/li>\n<li>Allow skin formation (~30 minutes), full cure rate of 1\/8&#8243; per day.<\/li>\n<li>Paint (if desired) after 2 hours for water-based paints or after full cure for other paints.<\/li>\n<\/ol>\n<h2>What&#8217;s In the Box<\/h2>\n<ul>\n<li>1 \u00d7 10.1 fl oz cartridge (Black)<\/li>\n<\/ul>\n<h2>Care &amp; Maintenance<\/h2>\n<ul>\n<li>Store unopened cartridges in a cool, dry place.<\/li>\n<li>Use within 12 months of manufacture.<\/li>\n<\/ul>\n<h2>Safety &amp; Compliance<\/h2>\n<ul>\n<li>VOC compliant \u2013 qualifies for LEED credit<\/li>\n<li>Meets ASTM C920 and Federal TT-S-00230C<\/li>\n<li>USDA approved for food area use<\/li>\n<li>Prop 65 Warning \u2013 reproductive harm<\/li>\n<\/ul>\n<h2>FAQs<\/h2>\n<ul>\n<li><strong>Q:<\/strong> Is it paintable?<br \/>\n<strong>A:<\/strong> Yes, with water-based paints after 2 hours, or after full cure for other types.<\/li>\n<li><strong>Q:<\/strong> Can it be applied in cold weather?<br \/>\n<strong>A:<\/strong> Yes, suitable for application above 0\u00b0F (-18\u00b0C).<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The CRL M64BL Black Polyurethane Construction Sealant is a one-part, moisture curing, low modulus sealant with primerless adhesion on most surfaces. Ideal for exterior and interior joints in metal, masonry, RV builds, and storefront installations.<\/p>\n","protected":false},"featured_media":4356,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_brand":[],"product_cat":[224],"product_tag":[225],"class_list":{"0":"post-4354","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-accessories","7":"product_tag-installation-materials","8":"product_shipping_class-sfr","10":"first","11":"instock","12":"taxable","13":"shipping-taxable","14":"purchasable","15":"product-type-simple"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Black Polyurethane Construction Sealant \u2013 CRL M64BL<\/title>\n<meta name=\"description\" content=\"Durable, VOC-compliant CRL M64BL sealant for moving joints in metal, masonry, and RV builds. 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