Flex Seal Spray can be applied to metal surfaces that show signs of corrosion, but surface preparation is essential for the best results.

Why Preparation Matters

Flex Seal Spray bonds to metal and creates a waterproof, flexible seal that protects against moisture, air, and rust. However, applying it directly over flaking or loose corrosion can reduce adhesion.

Before spraying, be sure to:

• Scrub away loose rust, dirt, or debris using a wire brush or sandpaper
• Wipe the area clean and let it dry completely
• For best results, work during dry, mild weather when possible (ideally between 60°F and 90°F)

Protective Performance You Can Count On

Once applied and fully cured, Flex Seal Spray forms a durable, rubberized coating that helps seal out water and prevent further rust. This makes it a great option for protecting metal equipment such as outdoor tools, grills, storage units, or machinery from additional corrosion as seasons change.

Flex Seal Spray doesn't just cover corrosion, it helps stop it from coming back. With proper prep and application, it's a simple and effective way to extend the life of your metal gear after a harsh winter. To learn more about Flex Seal Spray, download our Product Reference Guide.