I have to agree with Alice Q, I used the Invisagrip on one of my new rulers and it didn't help at all. It looked to me like the really thin clear plastic you used to be able to get cut from a roll at the Walmart fabric dept. The reusable wonder tape (or whatever it's called) is the same stuff I think? I've been happy with my sandpaper dots for years though sometimes they get in the way because you can't see through them (you can make your own cheaply with regular sandpaper and double-sided tape). I've heard a lot of talk lately about putting clear nail polish on rulers, sprinkling salt on them and letting them dry. I will have to try that. I also put my pinky on the fabric right next to the ruler to keep it from moving.