Seal Trust Water-Cut Off Mastic 10 oz

The Seal Trust Water-Cut Off Mastic 10 oz is a caulk & sealant for jobs that require Seal Trust model/MPN STM4012 in the TB sell unit. Seal Trust Water Cut-Off Mastic is a gray solvent based caulk designed to be used under the membrane to prevent water infiltration

Key Specs

• Brand: Seal Trust
• Model / MPN: STM4012
• SKU: SEAWC
• Sell unit: TB
• Product type: Caulk & Sealant
• Size / color: 10 oz
• Category: Building Materials | Building Materials/Caulk & Sealant

Key Features

• Meets OTC VOC requirements
• Water Cut Off Mastic is gray colored and meant to be used UNDER single ply membranes such as EPDM and TPO as a preventative measure to stop water from entering the roof system
• Use at all drains and penetrations

Coverage & How Much You Need

Coverage or yield is not specified in the available product details. Use the manufacturer installation instructions and project takeoff before converting the job size into order quantity.

Compatibility / Fitment

Use this item only when the brand, model/MPN, size/color, sell unit, and system type match the project specification. Do not substitute it for a different caulk & sealant, pack size, color, membrane/system family, or installation condition without checking the manufacturer instructions.

FAQs

What exactly am I ordering?

Seal Trust Water-Cut Off Mastic 10 oz, sold as TB, with SKU SEAWC and manufacturer model/MPN STM4012.

What model or part number should I match?

Match model/MPN STM4012 and confirm the brand is Seal Trust. If the job spec lists a different model, size, color, or system family, hold for review.

What unit is the price based on?

This listing is built around the TB sell unit. Confirm the unit before comparing price, quantity, or coverage.

How do I estimate quantity?

Coverage or yield is not specified in the available product details. Use the project takeoff and manufacturer instructions before estimating quantity.

What should be checked before purchase?

Confirm the model/MPN, sell unit, size/color, jobsite condition, compatible system components, and any manufacturer installation limits before approving the order.

Roofing and exterior-envelope work can involve fall hazards, weather exposure, fumes, adhesives, and system-specific installation requirements; follow the manufacturer instructions, OSHA-safe work practices, and local code or use a qualified contractor.

Product Expert Notes

Choose this item when Seal Trust model/MPN STM4012, SKU SEAWC, and the TB sell unit match the project requirement. It is best treated as an exact-match material selection, not a generic substitute.