No problem, Im not sure but if the other side of the magnet is clear/flat, you can sand down the old logo side, then spray paint a base coat of primer to cover up all of the rough scratches and things, then spray paint a base colour of your choice. Then turn the magnet around so the flat side with no marks faces outwards. Then you can use this guide to give you some tips about using vinly, Its not a perfect guide because they use a machine for the cutting but if you get the logo as simple and as big as you can then free handing it shouldn't be too bad. Whats good about vinly is if you mess up it doesn't mean you have to sand down the surface and re-paint it.