Priming with these products transforms supports not usually used for watercolor, such as canvas, painting boards, and wood, into suitable grounds for watercolor painting. Available in coarse and fine textures. - Schmincke Aqua Primer - Fine, 500 ml bottleSchmincke Aqua Medium, PRIMER FINE 500ML - Priming with this product transforms supports not usually used for watercolor — canvas, painting boards, wood — into suitable grounds for watercolor. This 500 ml bottle of Fine primer creates a soft and even surface that helps the smooth transition of one color into another, creating lovely effects. It is especially well suited for wet-into-wet application. The primer can be tinted with tube watercolor or acrylics. Apply at least 3 layers of primer on the surface with a brush, spatula or roller. The surface can be painted after the primer has completely dried.