Akeela Water-Based Alkyd Resin Paint 18 Color Set The surface dries with the evaporation of water, but it hardens slowly, so you can take your time cleaning up your tools and correcting your work. Also, when completely hardened, it creates a very strong paint film and exhibits excellent adhesion and water resistance, so it can be applied directly to glass and metal, allowing for a wide range of uses. As shown in the photo, some have been used, but all of the paints have more than 80% to 90% remaining. I've been storing these for several years, so I opened the lids to check, and they didn't seem to be hardened. However, I haven't actually tried using them, so some might be difficult to dispense.