Long oil alkyd 21-3416 Long oil alkyd Mineral and Pigment Solutions Inc. Alkyd Resins >> Long-oil Marine /Anti-Corrosive / Protective Architectural / Decorative >> Primers General Industrial /Maintenance 98% - theoretical non-volatile Minor amts Tech Xylene Alkyd resin 21-3416 is produced by reacting a dibasic acid with a polyol and drying oil. The existence of numerous possible reactants leads to an almost endless variety of finished resins. The oil length of an alkyd resin is defined as the number of grams of oil used to produce 100 grams of resin. As the oil length of the resin increases, generally the viscosity decreases, the hardness of the film decreases, film flexibility increases and water resistance is reduced. It is easily air dried and are readily soluble in aliphatic solvents. They can be applied by brush or spray and are extensively used in architectural coatings such as, porch, deck and trim enamels; primers and maintenance paints and marine finishes. Long oil alkyd resin. Air dried and readily soluble in aliphatic solvents. Used in architectural coatings, maintenance paints and marine finishes.