Now that there is filler it will hold the panel from oil canning..
It looks really good now. The word bang is to harsh, Tap tap is what those obvious high spots need to help them down easy, then re float one more time with a tight skim coat.
It is a mistake to believe primer will "take care" of what needs more metal/filler work...
http://youtu.be/G9ux6abzW1M
Yes , a 2 part putty like *Iceing would be a good skim coat...