Flexible Waterproof Mastic | For Pipes, Conduits & Wall Gaps

Help block water and air leaks around pipes, conduits, and wall openings with a flexible sealing mastic. Its dense formula expands slightly as it’s applied to fill small gaps. Use it in areas such as basements, bathrooms, and outdoor installations where moisture control matters.

Made for practical repairs

• Adheres to wood, concrete, metal, PVC, and drywall without primer.
• Forms a flexible seal designed to resist peeling and cracking as temperatures change.
• Sets quickly to help reduce downtime during repair work.
• Its low-odor formula is described as free of volatile organic compounds and toxic additives.
• The dense, non-porous barrier helps keep insects from passing through small openings.
• Suitable for new construction and retrofit applications.

Specifications

• Dimensions: 10.6 × 6 cm (4.17 × 2.36 in)
• Materials: polydimethylsiloxane, polyurethane, silica, methyl methacrylate, and epoxy resin
• Application temperature: above 41°F for optimal curing
• Formulation: non-flammable and non-corrosive

Before and after application

For best adhesion, apply to surfaces that are clean, dry, and free of dust or grease. Keep the area away from water during initial curing. Wear gloves while applying and wash hands after handling uncured mastic. Store sealed in its original packaging in a cool, dry place.

In the package

Two waterproof sealant mastic units.