I have not used them, but what I like is a new product by Rust-Oleum that can be purchased at Home Depot. It is a can of Anti-slip coating and comes in a 12 oz can. I paid $6.79 for the can. Spray it on your rulers and it works like a charm. Here is the link to it
http://www.homedepot.com/p/Rust-Oleu...8652/203483351
It dries in 30 minutes. I love it...
Elaine