I use Tamiya wax, and I love it. It will indeed protect the finish from finger prints, makes them wipe right off. Works great on windows, too. It’s easy on the decals and gives them a nice sheen. Beware that after applying the wax the body will be very slippery. Also, after applying wax nothing else will stick to the surface (decals, glue, paint, BMF, etc) so be sure it’s the last thing you do to the body or glass.