Frustrated with inability to do body work!

Once you pull out the primer,80 grit goes away. My body shop guy works with finer paper all the time. Especially the glazing putty, which is now 2 part like filler. I tried sanding it, coarse paper hardly marks if, but 220 makes dust.
He also uses tape lines, fills up to the tape and blocks it off.
And only sands cross-hatch.