Duct Mastic Sealant

STC Duct Mastic Sealant is a single-component, acrylic, water-based mastic. This product is intended for use as a flashing material for most substrates and a sealer for seams, fasteners, penetrations, and other details in roof coating applications. Duct mastic sealant can be used to fill in small cracks and alligatored asphaltic roof surfaces.

Product Details

Features and Benefi ts
• Can be applied with trowel, roller, or brush
• Easy cleanup with water
• Superior adhesion
• Long-term durability
• Single-component, low-odor
• Easy to use in most applications
• Excellent sealer over fasteners, rough substrates, seams, details,
and transitions

• Low VOC levels allow for application in most regulated areas

Acrylic sealant

Duct Mastic Sealant

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