How Much Area Will 1 Gallon of Flex Seal Cover?
Planning a project and wondering how far one gallon of Flex Seal Liquid® can go? Knowing how much area a single gallon can cover is essential for estimating how much product you'll need.
Flex Seal Liquid Coverage Per Gallon
One gallon of Flex Seal can cover approximately 30 square feet per coat, depending on the surface texture and the thickness of the application.
Keep in mind:
· Rough or porous surfaces (like concrete or stucco) may absorb more product, reducing overall coverage.
· Smoother, non-porous surfaces will generally give you better spread and more square footage.
· Multiple coats may be required for maximum waterproofing and durability, especially in high-exposure areas.
How to Get the Best Coverage
To make the most out of your gallon of Flex Seal Liquid, here are a few tips:
· Clean and dry the surface thoroughly before application.
· Apply in even, consistent layers—not too thick, not too thin.
· Let each coat dry fully (24–48 hours depending on humidity and temperature) before applying the next.
Ideal Uses for a Gallon of Flex Seal Liquid
· Waterproofing roof sections or skylight seams
· Sealing foundations, basement walls, or crawlspaces
· Coating gutters, downspouts, or outdoor furniture
· Protecting wood, metal, or concrete surfaces from moisture and corrosion
Flexpert Tip: If you're tackling a larger project or applying multiple coats, you may want to go with our MAX 2.5-gallon size to ensure you have enough product to finish the job properly. Want to learn more about applying Flex Seal Liquid for maximum results? Check out our How-To Blog for step-by-step instructions and pro tips.
