SunnySide Boiled Linseed Oil extends and fortifies oil-based paints and coatings creating a quality finish on fine wood and antiques. Boiled Linseed Oil brings out the natural wood tones and grain patterns of wood. Boiled linseed oil penetrates and seals unfinished wood surfaces protecting against scratches, nicks, and watermarks. Boiled Linseed Oil improves the flow, leveling and durability of oil-based paints and adds a nice gloss to the final finish. Gallon.