Protect your oil painting from age and environmental damage from dust and dirt. 6 to 12 months after completion, your oil painting is ready to varnish. Cobra Odourless Painting Varnish gives an even sheen and adheres best to Cobra Water-Mixable Oil paintings. Will not crack or yellow and can be removed using odourless white spirits. Must be applied in a well ventilated area. Gloss or satin finish.