You wanna test that Sharpie idea on an old clunker...I am 100% certain that it won't
completely "wipe right off"
any finish. It's hard to get completely off aluminum. It will
always show an image on Nylon, Delrin, UHMW, and probably Teflon. I'm sure it would show on any sort of paint. The "dry erase" marking pens should be fine, but maybe not durable enough, and often somebody will pick up an El Marko and totally ruin that new scoreboard that was intended to use with "dry erase" markers.

Steve