I struggled with this for a year before I gave up.  I have a ruler rack, resulting in constant battle of trying to get ruler in rack with film scrunching up, just didn't work.  I really didn't see a lot of difference with regards to stopping or reducing slippage when cutting fabric, especially on the long and large rulers.  I have RA and cutting and "firmly" pressing down on ruler was frustrating.  So I switched to little silicone dots! They work!  I've removed all the film from all my grids and the dots don't hamper rack storage!