Thanks Rob.
Yes, I use Bondo for slot repair. I prefer it as it is smoother, and the drying time is very fast.

Fill the slot and sand the top flush.

And simply route a new one.
HOWEVER...
some people do NOT want the smell/fumes of Bondo in the house :)
This is where Durham's works best. It's odor free, so you won't get yelled at for making the house smell like a body shop. :)
Shotgun Dave reminded me of that tonight and is well worth mentioning.
So either product will do the job.