Flex Seal MAX 17 oz black can ready to seal leaks on gutters.
Flex Seal MAX spray action sealing a roof seam for waterproof protection.
Flex Seal MAX being applied to crack to create a rubberized seal.
Flex Seal MAX durable coating forms a flexible, watertight film after cure.
Flex Seal MAX applied on an RV exterior for weatherproof protection.
Flex Seal MAX coating around window frames to prevent drips.

Flex Seal

Flex Seal MAX 17 oz Black — 2-Pack Waterproof Rubber Spray Sealant for Gutters, Roofs, RVs & More

High-performance tools and home improvement made for confident daily results

$47.85

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Why customers choose TaskHolt Tools

Overview

Flex Seal MAX is a 17 oz black spray-on sealant that creates a durable rubberized coating. In a quick pass, it coats seams and cracks, forming a flexible film that sheds water and adapts to changing temperatures. When dry, it can be painted to blend with surrounding surfaces.

How it works

Applied as a spray, the formula seeps into tiny gaps and larger leaks alike. It dries to a watertight, rubber-like layer that remains pliable year after year, resisting cracking in cold weather and sagging in heat.

  • Seeps into cracks and holes for thorough coverage.
  • Dries to a waterproof, flexible coating that stays pliable over time.
  • Can be painted once cured for a seamless look.
  • Withstands seasonal temperature changes without cracking or peeling.

Where to use

Use Flex Seal MAX on a wide range of outdoor and indoor surfaces. It is well suited for gutters, roofs, skylights, windows, wood projects, and exterior surfaces on RVs and campers. It also works for arts, crafts, and hobby projects that require a quick sealant solution.

  • Gutters, roof edges, skylights, and window frames.
  • Wood decks, sheds, campers, and RVs.

Tips for best results

Prepare the area, shake well, and apply in steady, sweeping motions. For tougher leaks, apply multiple coats and allow each layer to dry before continuing. Keep away from heat sources during application and curing.

FAQ

Q: Is Flex Seal MAX suitable for outdoor use?

A: Yes. It forms a flexible, waterproof coating that withstands temperature changes and can seal gutters, roofs, and RV exteriors.

Q: How should I apply Flex Seal MAX for best results?

A: Shake well, spray evenly onto clean, dry surfaces. For larger leaks, apply multiple coats and allow each to dry.

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