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.