Thanks Dave,

A "dinghy centerboard tape" search led me to all kinds of links including a discussion on gelcoating a piece of 3mm dyneema to the rear of the trunk. Don't plan on standing the 20 on her sterns anytime soon! <img src="http://www.catsailor.com/forums/images/graemlins/smirk.gif" alt="" />

Looks like "Jap" (Japanese Glide) tape will do the trick as well.

Maybe I was waaaay overthinking this but isn't there a possibility of the board "hunting" from side to side in light winds?