I imagine many of us have read or heard about doing this. I find when a member shares actually doing some of the things I've read about, it really brings it home so, here's my contribution.
I was epoxying something the other day and so prepared one of my ZCI's by applying packing tape along the wear-worn slot on the top surface toward the front. Once I was done with my project I drizzled the leftover epoxy into the slot from the underside.
Once it is set up, you make a new "original" cut just like the first time you used it.
The picture isn't great but, I think you can see where the epoxy fills in the widened slot.
This sort of wear happens as the material is pulled through the slot during a cut. The phenolic lasts longer than my BB ply ones but, the result is eventually the same. Next time your epoxying something, prepare an old ZCI ahead of time and try it out.