Gamblin 3-in-1 Medium is a versatile oil painting medium crafted for use throughout every phase of painting. It serves three primary functions: acting as a lean, thin medium suitable for washes and underpainting; facilitating oiling out to assess if a painting is ready for varnishing or requires further work; and preparing wood panels prior to priming with Gamblin Ground. Composed of Gamsol, Safflower Oil, and soybean alkyd resin from Gamblins Galkyd line, this refined formula offers controlled drying times and consistency, providing artists with a reliable alternative to mixing their own solutions.