Flex Seal FSMAXBLK24 MAX Black Rubberized Spray Sealant Coating 17 oz

Flex Seal MAX is a 17 oz. black aerosol rubberized liquid sealant coating designed for maximum coverage and leak-stopping power. The larger MAX size delivers up to 20% more coverage than the standard Flex Seal can, making it the most economical option in the Flex Seal lineup. Whether you're tackling a weekend repair or a larger project, Flex Seal MAX provides a fast, watertight solution.

How It Works:

Flex Seal MAX sprays on as a thick liquid that penetrates cracks and gaps, then dries to a flexible, watertight rubberized coating. It bonds to virtually any surface and remains effective in both hot and cold temperatures — it will not sag or drip in summer heat, nor crack or peel in winter cold.

Key Features:

• 17 oz. aerosol can — up to 20% more coverage than the original Flex Seal size
• Sprays on as a liquid and dries to a flexible, waterproof rubber coating
• Seeps into cracks, holes, and gaps to stop leaks fast
• Can be applied to wet or dry surfaces
• Helps prevent rust and corrosion on metal surfaces
• Will not sag, drip, crack, or peel in extreme temperatures
• Color: Black
• Net Weight: 17 oz.

Compatible Surfaces:

• Aluminum, Metal, Cement, Concrete
• Drywall, Fabric, Glass, Masonry
• Plastic, Porcelain, Rubber, Tile, Wood
• Some Vinyl

Common Applications:

• Leaky roofs, gutters, and downspouts
• Roof drip edges and flashings
• Hose and PVC pipe repairs
• Windowsill sealing and repair
• RV, camper, and marine sealing
• Skylights and roof vents

Flex Seal MAX is an ideal addition to any maintenance toolkit — whether for home, automotive, marine, or RV applications. Part number: FSMAXBLK24.