Daler-Rowney Artists Clear Picture Varnish is a removable picture varnish that produces a clear even gloss finish, which will not yellow or bloom when painted on dry oil paintings. When applied lightly by a spray diffuser it makes an excellent Retouching Varnish. It may be used on both oil & acrylic painting. Daler-Rowney Artists Clear Picture Varnish will give your painting a protective layer from light and dust and will also make the colours appear more dense and vibrant. It is recommended that you wait approximately six months before varnishing an oil paining to ensure that the paint is fully dry. Remove dust particles and apply a thin coat of varnish with a large varnish brush.