Winsor & Newton Oil Painting Primer is a non-yellowing primer made with an oil-modified alkyd resin medium. This primer requires no thinning or stirring, so it ready to use as soon as it is in your hands. Oil Primer can be applied directly to metals or porous surfaces - including glue-sized canvas, untreated wood, hardwood, plywood and paper - with virtualy no sinking in. You can also tint this primer with a small amount of oil colour to created a coloured painting ground. Any surfaces treated with this primer will accept oil colours easily without chalkiness or absorbency.