Intergrain Universal Timber Oil Intergrain Universal Timber Oil is a deeply penetrating, oil-based clear timber oil that nourishes and helps protect the structural integrity of all exterior timber. Features Unlocked-System Deeply Penetrating Clear Oil Based Timber Oil Areas Decking, cladding, screening, furniture, windows, doors, plywood, beams, fascia boards, shutters, joinery, fences, posts and engineered products. Substrates Jarrah, Merbau, Spotted Gum, Pine Colour Clear