Obliterates unsightly stains and stops them reappearing. Can be painted or wallpapered over - spray application delivers fast even coverage. This 400ml stain block from Ronseal is ideal for walls & ceilings, and blocks stains around the interior of your home. It dries in 4 hours. As it's paintable, it's ideal for colour matching to your existing decor. Ronseal Stain Block 400ml Obliterates unsightly stains and stops them reappearing Can be painted or wallpapered over - spray application delivers fast even coverage Permanently blocks out stains on interior walls and ceilings - aerosol delivers even accurate coverage.