This yellow glass marker makes it easy to express yourself on any glass surface. For use on auto glass, home windows, store front windows and school windows to show team spirit, announce weddings, special occasions, events or sales. Easy to remove. Unique formulation will not run in the rain. Non-Toxic. Improved Opacity. Vibrant Color. Note: with auto use, do not block driver"s vision. Do not use directly on car paint. Permanence and staining will occur on porous surfaces and clothing.