The Daler-Rowney Oil Mediums Retouching Varnish provides an excellent temporary protective shield for newly completed oil paintings while they undergo their deep curing process. This quick-drying, UV-resistant formula can be applied as soon as the paint film is touch-dry to eliminate dull patches and restore original colour depth across uneven areas. It allows the oil paint underneath to continue breathing and hardening safely until a final, permanent picture varnish can be layered on months later.