Ok i sanded my car down to the metal and used and did what i thought all my bondo work and put epoxy primer on top. Next i followed up with a 2K primer but i had a high spot on on part of the quater panel and had took it back down to the metal in those small spots and then also my nephew was playing in the garage and his bike fell over and the handle bars scratch of 5 inchs of primer now the question is what do i do to correct this do i need to sand down a large spot were i done hit metal and reepoxy it and 2k it or what.

Any bare metal, its best to epoxy first then fill prime. Even the small bare spots. You can just brush it on. That way you dont have to clean the gun. Most of it will be sanded off removeing any brush marks. When you get close to painting the car then only spray the primers.

Just sand it down, and re epoxy. Shouldn' be a problem. Are you going to put sealer on the whole car before base?