Putty/ˈpʌti/ Definition 1 of 3Pro Tip 1/3Home Repairs Putty is commonly used in DIY projects, especially for sealing windows or filling holes. I need to get some putty to repair the window frame. Pro Tip 2/3Malleable Texture Putty is moldable and soft, allowing for easy shaping when applying it to surfaces. Make sure the putty is soft enough to push into the gap. Pro Tip 3/3Dries Hard Although putty starts off pliable, it hardens when it dries, creating a solid fill. Let the putty dry overnight; it will harden and seal the crack.