Oil varnishes are used to coat oil paintings, and are used to give the painting a fresh, vibrant appearance. Adding a smooth varnish to your artwork will keep your oil painting looking its best, and will preserve it for from dirt and dust. We supply an entire range of both matte and gloss varnishes, so you can select the right varnish for you depending on your style. At Cowling and Wilcox, we supply a wide selection of oil varnishes and mediums from leading brands such as Winsor & Newton and Daler-Rowney. Shop online today.