I have used the sandpaper dots, but on my larger rulers (6 1/2 x 24) which I use to cut long strips/borders, it still slips! I guess I don't have enough on-but there were so many other suggestions here, I think I will buy Invisigrip at Joann's with a coupon. Don't know why I never thought of looking for someting else! The dots are fine on the smaller rulers. I have had them on for years and none have fallen off.