As to filling pits, I would not use spot putty. Might not hold up the baking step. Duracoat makes a pit filling material called Durafil. Don't know if it would hold up either. Why not take a hint from Duracoat, spray a heavy coat of Cerakoat on the pitted area, bake, then sand down to leave the pits full, like filling the grain on wood.
