Jo Sonja's opaque primer, Ultra Cover is the perfect one step prep for almost any type of surface. Prepares and seals most surfaces including wood, canvas, glass, plastic, terra cotta & metal. It's thick consistency is easily brushable and durable. This White is easily tintable using Jo Sonja's Artist Colours, so you can create the perfect basecoat layer. Water-based, non-toxic and environmentally friendly.