RE-SKIMS Skimming is a method of plastering usually done on plasterboard, artex or old and damaged plaster. It has a smooth finish and is suitable for painting or wallpaper once dry. Very often when people start to decorate an older property, they usually find the old plaster, cracked or damaged and not suitable for painting and decorating. The solution would be to re-skim the walls, but only after the walls have been properly prepared and treated.