White Gloss Magnetic Vinyl can easily be cut to size. You can make your signs. This will not scratch or mark any surface. The magnet material is designed also for outdoor use and will not rust and the magnetic holding strength does not reduce over time so your you can use the signs again. You can also use it as a whiteboard with a suitable pen. Just wipe with a tissue or cloth. The magnets should be removed and cleaned after each use or at regular periods to avoid sticking.