Yep, I have used Invisigrip on most of my rulers and it helped.
Now The Grace Company has come out with a much better product ... look at their website. It is with their new rotary cutting system items.
Would love the new rotary cutter and ruler but not just yet. The little 'grippers' are affordable though. A quilting friend who also has arthritis loves these as they keep her more pain free when cutting.
ali