Water-based formula is nonflammable, making it ideal for school use. It's low odor and produces no harmful vapors. Wite-Out® Brand foam applicator gives you quicker, neater and more precise corrections than standard brush applicators. Advanced technology allows application of just the right amount of fluid—every time! For water-and solvent-based inks, permanent marker, ballpoint pen, roller pen, highlighter, pencil, photocopies, faxes, laser and ink jet.