Honestly, you leave it in your tool box unless you are filling some MONSTER dents with a LOT of filler.
I personally don't touch that tool but a time or two a year and I do this work every day for a living. It is for SEVERE plastic filler work. Anything that we usually would repair wavy panels, dents and dings you shouldn't even think of using a cheeze grader. It causes more work by digging into too deep. It "forces" you to apply too much filler, etc.
