I love sandpaper dots (4-8 on the long rulers), Invisigrip works well, also, but here's a quickie tip. Depending on the size of your ruler, put a few small dots of clear nail polish on the back and sprinkle salt on them. Once they wear off, do it again. JoAnn's sell sandpaper dots and many quilt shops have the Invisigrip or get it on-line. Also, when using a long ruler (24") "walk" your left hand up the ruler while using the blade in your right hand.