What is Gamblin 3-in-1 Oil Medium? This lean, ready-to-use medium replaces custom mixing and supports multiple stages of oil painting. It dries in about 24 hours for underpainting and washes, helps even out surface sheen when oiling out, and can also be used to size raw wood panels before priming. A single medium designed for flow, clarity, and consistency in the studio. Shop at our link in profile or comment GAMBLIN for the link to be sent to your DM! gamblincolors #OilPainting #OilPaintingMedium #Gamblin #ArtistMaterials #PaintingProcess