What can Flex Seal Spray Do? Pretty much everything! Our rubberized sealant spray coating sprays out as a liquid, seeps into cracks, holes and hard to reach places, and then dries to a watertight, flexible coating that lasts for years. With this easy-to-use, portable aerosol spray you can: Fix leaky roofs, gutters, and downspouts ✔️ Prevent rust ✔️ Seal windows ✔️ Fix leaking Pipes ✔️ Repair RV’s, campers, and mobile homes ✔️ DIY projects ✔️ And, much, much more! ✔️ And for more vibrant repairs,