OK, I know this may have been asked a million times BUT since i don't make signs i don't pay too much attention. A friend has asked me to make him something and my question is, what is the best WOOD to use for a sign. He doesn't want signfoam or extira, or any of these fancy materials just something simple so I wondered what wood would be the best for a siple 24" round or 15"x30" outdoor sign. Also since it is wood what surface protection would be best for it? Thanks guru's!