Flex Seal Liquid Clear Rubber Sealant — 16 oz Brushable, Waterproof Coating

Flex Seal Liquid is a brushable, rollable, pourable clear rubber coating that creates a waterproof, flexible barrier. Flex Seal Liquid Rubber Sealant Coating in a 16 oz can is a versatile clear formula designed to form a watertight, elastic layer over surfaces. It applies like paint but cures into a durable rubber membrane that resists UV, chemicals and corrosion. Use it indoors or outside to stop leaks, protect metal from rust, quiet surfaces, or add a protective finish to many materials.

Because it goes on smooth and covers quickly, Flex Seal Liquid is meant for projects where a flexible, moisture-blocking seal is needed without the complexity of tapes or caulks. It adheres to wood, metal, masonry, concrete and many plastics; once cured it stretches with the substrate to maintain a continuous seal. This product is clear, so it preserves surface appearance while adding protection.

How do I apply Flex Seal Liquid for best results?

Prep the area by cleaning away dirt, grease, loose paint and rust. Stir the can thoroughly, then brush, roll, dip or pour the liquid onto the surface in the thickness recommended for your application. Allow adequate drying time between coats to build up the desired rubber layer.

• Clean surface: remove contaminants and loose material.
• Stir well: ensure even consistency before use.
• Apply: brush, roll, dip or pour in even coats.
• Cure: allow full drying between coats for durable rubber film.

What surfaces and situations is this clear coating suitable for?

Flex Seal Liquid is formulated to work on many substrates including metal, wood, concrete and some plastics. It’s ideal for stopping water intrusion, protecting against corrosion, sealing joints and adding a flexible barrier on irregular shapes. Avoid surfaces that stay constantly submerged unless specified by the manufacturer.

• Metal roofs, gutters and flashing for leak protection.
• Wood decks, planters or trim to repel moisture.
• Concrete cracks, foundations and masonry for added sealing.
• HVAC boots, vents and seams to reduce air and moisture entry.

How durable is the coating and what protections does it offer?

Once cured, the liquid turns into a flexible rubber membrane that resists UV exposure, many chemicals and helps prevent rust and corrosion on metal surfaces. It stretches with movement to maintain a seal and can be reapplied for maintenance or to increase thickness where needed.

• UV resistant finish to minimize sun degradation.
• Chemical and moisture resistance for extended protection.
• Flexible adhesion reduces cracking on moving substrates.
• Prevents rust by blocking water and air contact on metal.

How much area will a 16 oz can cover and how do I plan coats?

Coverage depends on the surface texture and desired film thickness; smooth surfaces require less material than rough or porous ones. Apply thin, even coats and allow full cure between layers to achieve a consistent, resilient membrane. Multiple coats increase durability and waterproofing performance.

• Estimate coverage by surface porosity and desired rubber thickness.
• Thin coats dry faster and reduce drips; build multiple layers.
• Allow recommended cure times for a fully effective seal.

Who is this for: Flex Seal Liquid in clear 16 oz is geared toward homeowners, handypersons and pros who want a quick-to-apply, flexible waterproofing solution without changing surface appearance. It suits anyone sealing leaks, protecting metal from corrosion, weatherproofing outdoor fixtures, or adding a protective coating to varied materials. Choose this product when you need a brushable or pourable rubber sealant that balances ease of use with resilient, long-lasting protection.

FAQ

Q: Can I paint over Flex Seal Liquid once it cures?

A: Yes, once fully cured, most paints adhere to the rubberized surface. Test a small area and use compatible primers if needed.

Q: Is this product safe for continuous submersion?

A: Flex Seal Liquid is water resistant and durable, but continuous full submersion is not recommended unless manufacturer guidance specifies suitability.