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.

Key Specs

• Brand: Duro-Last
• Model / MPN: 1129
• SKU: DURLSM350
• Sell unit: RL
• Product type: Butyl Tape
• Size: 350'
• Category: Building Materials | Building Materials/Tapes & Adhesives | Building Materials/Tapes & Adhesives/Butyl Tape

Key Features

• Verify exact model, size, color, sell unit, and system compatibility before ordering.

Coverage & How Much You Need

Confirm coverage/yield from the manufacturer instructions and job takeoff before ordering.

Compatibility / Fitment

Use only with compatible systems and installation conditions specified by the manufacturer.

FAQs

What exactly am I ordering?

Duro-Last Duro-Mastic Butyl Sealant 350', sold as RL, SKU DURLSM350, manufacturer model/MPN 1129.

What unit is the price based on?

The price is for the RL sell unit.

What should I match before ordering?

Match brand, model/MPN where available, size/color, sell unit, and the project specification.

Can this be substituted?

Treat this as an exact-match building material selection; hold for review before substituting a different model, color, size, or system family.

How do I estimate quantity?

Use the project takeoff plus manufacturer installation instructions, including waste, overlap, and accessory requirements.

Follow manufacturer instructions, OSHA-safe work practices, local code, and project specifications.

Product Expert Notes

Choose this variant when Duro-Last, SKU DURLSM350, RL sell unit, and MPN 1129 match the job requirement.