Can I Apply Flex Seal Liquid onto Rusted Metal, or Must I Remove Rust First?
Flex Seal Liquid is a strong, durable liquid rubber coating that can protect a variety of surfaces from moisture and corrosion. But when it comes to applying it over rusted metal, proper prep work is essential.
Surface Prep Matters
While Flex Seal Liquid is designed to help seal out water and prevent future rusting, it's not a rust remover. For best results, remove as much loose rust, flaking material, and debris as possible before application. Use a wire brush, sandpaper, or steel wool to scrub the surface, and then wipe it clean.
Why Rust Removal Is Important
Leaving flaky rust or loose particles underneath the coating can lead to adhesion issues, which may cause the sealant to peel or bubble over time. Flex Seal Liquid bonds best to solid, clean surfaces. Once prepped correctly, applying Flex Seal Liquid can help encapsulate the area and protect it from further exposure to air and moisture, both of which contribute to rust.
Steps for Success
- Scrub away loose rust or flaky areas.
- Clean the surface thoroughly and let it dry.
- Apply Flex Seal Liquid in even coats using a brush or roller.
- Allow each coat to cure fully (24–48 hours, depending on thickness and conditions).
Have more questions about Flex Seal Liquid? Read our FAQs for answers!
