Caulk Once is a premium quality acrylic caulk that has been formulated to outperform all other conventional decorating caulks and fillers. Fast-drying and permanently flexible, Caulk Once can be over painted in 1 hour with all paint types or covered over with wallpaper. Caulk Once has been manufactured using an advanced high quality polymer to offer superior adhesion, low shrink as well as tooling down smoothly.Caulk Once should be at room temperature when you begin using the product. If the caulk has been stored in cool conditions it should be placed in a warm room / bucket of warm water before use to gently heat up to working temperature.