Ghiant H2O Water-based Gesso has 90% fewer solvents and 35% fewer VOCs than a normal aerosol sprays. It will not yellow or discolour. Ghiant H2O Water-based Gesso is suitable for preparing surfaces for oil, alkyd and acrylic paint. This product creates a grainy surface for good paint adhesion. Always spray thin coats at a distance of 20 cm from the painting surface. It is recommended to wait at least two hours before applying additional layers. At least two gesso layers are required for oil paintings. Allow 24 hours for the product to dry fully. Shake well before use.