exterior, stain-blocking barrier effect when overcoating any of the following type, of stain: nicotine, soot, water, and discolouring wood constituents,, e.g. lignin, stain-blocking barrier effect when overcoating any of the following, types of stain: coffee, red wine, rust, and various writing utensils,, e.g. pens, pencils, text markers, etc., especially suitable for subsequent coatings with facade paints
