Si790

Silicone Mastic

Si790 is a premium, single-component, high-solids silicone mastic formulated for critical roof detail work. It seals seams, fasteners, penetrations, flashing, transitions, and other vulnerable areas, forming a durable, breathable, and watertight seal with excellent resistance to natural weathering.

Designed for broad system compatibility, Si790 is suitable for detailing and repair applications over spray polyurethane foam (SPF), EPDM, aged PVC, aged acrylic coatings, concrete, asphalt built-up roofing (BUR), granulated modified bitumen, and metal roof systems.

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Engineered Protection Across Commercial Roof Systems

Designed for critical roof detail work, SESCO Si790 Silicone Mastic seals seams, fasteners, penetrations, flashing, and transitions across low-slope and standing-seam metal roofs. It creates durable, watertight protection that withstands natural weathering while delivering a clean, professional finish.

The SESCO Standard

At commercial scale, contractors need certainty at every level: in the formulation, the specification, the supply chain, and the fulfillment process.

Warranty Backed Formulation

Performance begins at the formulation level. SESCO products are engineered for application consistency, system compatibility, and long-term performance across demanding commercial roof systems.

Supply At Scale

You’re part of the process. We keep communication open and decisions shared—no black boxes or surprises.

Technical Expertise

Clear specifications, system compatibility, and decisive technical guidance reduce uncertainty before materials reach the roof.

Operational Efficiency

Straightforward ordering, coordinated fulfillment, and reliable delivery keep materials moving and crews productive.

Contact Us

We’re happy to answer your questions about our roof coating products, spray foam products, warranties, and more. Fill out the form or give us a call to get in touch with our team.

Address

4140 Capital Drive New Albany, Indiana 47150

Phone

  • (812) 776-6727

Email

  • info@sescoroofing.com