After spending 2 1/2 hours taking off old body filler I find these holes. Obviously from prior body work being done. I'm going to continue to get the metal prepped but my question is how do I address these holes. I'm not a welder. Should I "punch" out the filler in the holes? Can I just lay over new filler to fill the holes? These holes are on the right hand rear quarter panel just below rear window.