Flex Seal MAX 17 oz White – Waterproof Rubber Sealant Spray for Gutters, Roofs & RVs

Fast, versatile leak protection in a white spray-on coating

Flex Seal MAX is a white spray-on sealant designed to coat, seal, and protect a wide range of surfaces in minutes. When you press the trigger, you’ll notice a steady spray that forms a rubbery film as it dries. The coating remains flexible, moving with the surface and resisting cracking or peeling over time. Once cured, the layer is paintable, allowing you to blend repairs with surrounding finishes for a seamless look.

This formula seeps into cracks and holes to create a solid, airtight barrier. It is designed to hold up under temperature shifts, staying pliable in heat and resisting brittleness in cold weather. The result is a durable seal that helps protect foundations, joints, and seams without the mess of traditional caulks or mastics.

Key benefits

• Spray-on convenience for fast sealing of leaks and cracks.
• Dries to a flexible, rubberized coating that stays durable for years.
• Seeps into crevices to protect edges, joints, and seams.
• Resists sagging in summer heat and cracking in winter cold.
• Paintable after drying for a finished look that matches surrounding surfaces.
• Versatile for crafts, DIY projects, and outdoor or indoor repairs.

Ideal uses and surfaces

• Gutters, roofs, skylights, and windows where water intrusion can occur.
• Wood, metal, concrete, plastic, and many common building materials.
• Outdoor campers, RVs, trailers, and other mobile environments facing weather shifts.
• Arts, crafts, and hobby projects that need a flexible protective coating.

Tips for best results: ensure surfaces are clean and dry before application, apply in thin, even coats, and allow drying between layers if needed. The white base can be tinted with compatible paints once fully cured. While Flex Seal MAX provides a practical DIY solution for leaks and weatherproofing, outcomes can vary based on surface type, environmental conditions, and proper application. Consider it as a helpful option in your toolbox rather than a guaranteed fix.