Found RUST-OLEUM AntiSlip spray at my hardware store and love it! With hand and wrist issues the simple non-slip they put on the back of rulers just didn't work. You can still move it to line up your markings on your fabric. Just a small amount of pressure holds it in place. I have sprayed 50+ rulers and could probably spray another 50, so one can goes a long way!!! I spray the back VERY LIGHTLY and it dries in about 5-15 minutes (depending on humidity in your area). It does frost the ruler so LIGHTLY is the key word! Have tried on all brands of rulers I own and all worked great.