Rust-Oleum 267972 LeakSeal Flexible Rubber Coating Spray, Aluminum

Like any type of paint or sealers, surface preparation is what really makes the difference on whethe it works or not. I decided to coat the metal roof of my outside storage shead. This all steel building is almost twenty years old and began leaking last winter. I had planned to coat it with "Flex Seal White. The original color of the roof. It is surface rusted in areas, but not bad. Water was also seeping through screw holes. I took a wire brush and electric sander and cleaned the entire roof first. Not heavy cleaning but enough to scratch the surface and get most of the rust and years of dirt and mineral build up off. Next, I used the sealer in white to spray the cracks and screw holes with several light coats, the recommended approach, then I coated the entire roof twice with a medium coat. That's a little more work, but helps to make sure it sticks for a long time. BTW, I also used the grey color to paint the top of my grey spa cover in the back yard. Same approach, and it worked perfectly also and looks brand new now! Great product! Using it to seal some small cracks on the side rain gutters and slide-outs on my motor home. Several light coats always works best in lieu of a single thick coat. Amazing!