Does Flex Seal Cover Rust

Flex Seal works because it sprays thick, much thicker than traditional spray paint. It seeps into cracks and, once dry, forms a rubberized surface that blocks out water, air and moisture – which helps prevent rust and corrosion.

Can flex seal be used on metal?

Flex Seal can be used on almost every surface: wood, metal, tile, concrete, masonry, fabric, glass, plastic, aluminum, porcelain, drywall, rubber, cement, and vinyl. Plus, it won’t sag or drip in the summer heat, and it won’t crack or peel in the winter cold.

What will flex seal not stick to?

The Flex Seal Liquid adheres to most surfaces, including metal, but not silicone. … The Flex Seal Liquid adheres to most surfaces, including metal, but not silicone. We recommend removing the silicone first, then making sure to clean and dry the area before applying the product for the best results.