Frustrated with inability to do body work!

It's normal for the first coat of primer to be absorbed by the filler especially if put over 80g scratch, but... and some will argue, and it depends on the primer also but priming over 80g can lead to sand scratch swelling later after the paint is put on. I always finish with 180g before prime. Polyester glazing putty is okay over primer so I would guide coat that mask out your body lines, block it out again skim any low spots with metal glaze and block that out. re-prime. Stay away from the acrylic/lacquer based glazing puttys as that stuff likes to shrink and it drys out and takes all day to dry thoroughly. Dolphin glaze, 3m metal glaze, Icing are all about the same product.