opjose

To add to what Outdoorhunting said...

I've repaired this same thing by sanding down the humps until the surface is level.

Then I'll mix in either microballoons or wood sawdust shavings into a 50/50 epoxy mix, to get a thick slurry of epoxy and filler.

Apply this into the holes filling them completely.

Let it dry for 2 days or more, re-cover if need be and redrill.