My 74 Duster project

Been able to work on the Duster quite a bit this weekend. Tail panel is ready for primer. Roof has been stripped, sanded, one seam sealed and a few hail dents repaired.

I thought I was ready to prime some of it tomorrow but I noticed a couple more hail dents (very small) as I was winding down for the night.

Need a little help. If I have a few small dings I find after the epoxy primer has been laid down, do I have to grind it back down to the metal to add a little filler or can it be filled on top of the epoxy? No big deal either way, I would just like to know what my options are and the propper way it should be done.