Duro-Last Duro-Mastic Butyl Sealant 350′

<p>The Duro-Last Duro-Mastic Butyl Sealant 350' is a butyl tape from Duro-Last for exact-match material ordering. Match manufacturer model/MPN 1129. This variant is sold as RL with SKU DURLSM350. Duro-Mastic is a high-performance elastic butyl tape for use with the Duro-Last roofing system.</p><h3>Key Specs</h3><ul><li><strong>Brand:</strong> Duro-Last</li><li><strong>Model / MPN:</strong> 1129</li><li><strong>SKU:</strong> DURLSM350</li><li><strong>Sell unit:</strong> RL</li><li><strong>Product type:</strong> Butyl Tape</li><li><strong>Size:</strong> 350'</li><li><strong>Category:</strong> Building Materials | Building Materials/Tapes & Adhesives | Building Materials/Tapes & Adhesives/Butyl Tape</li></ul><h3>Key Features</h3><ul><li>Verify exact model, size, color, sell unit, and system compatibility before ordering.</li></ul><h3>Coverage & How Much You Need</h3><p>Confirm coverage/yield from the manufacturer instructions and job takeoff before ordering.</p><h3>Compatibility / Fitment</h3><p>Use only with compatible systems and installation conditions specified by the manufacturer.</p><h3>FAQs</h3><h4>What exactly am I ordering?</h4><p>Duro-Last Duro-Mastic Butyl Sealant 350', sold as RL, SKU DURLSM350, manufacturer model/MPN 1129.</p><h4>What unit is the price based on?</h4><p>The price is for the RL sell unit.</p><h4>What should I match before ordering?</h4><p>Match brand, model/MPN where available, size/color, sell unit, and the project specification.</p><h4>Can this be substituted?</h4><p>Treat this as an exact-match building material selection; hold for review before substituting a different model, color, size, or system family.</p><h4>How do I estimate quantity?</h4><p>Use the project takeoff plus manufacturer installation instructions, including waste, overlap, and accessory requirements.</p><p><em>Follow manufacturer instructions, OSHA-safe work practices, local code, and project specifications.</em></p><h3>Product Expert Notes</h3><p>Choose this variant when Duro-Last, SKU DURLSM350, RL sell unit, and MPN 1129 match the job requirement.</p>