I'm sure that because of the clean body panels you have, that it was not bad at all as far as weight applied is concerned.
I've seen areas even on my car way back that were filled and sanded lightly instead of hammering the imperfections all out and using a minimum of putty. Even an expert body worker will apply a lot at first and then end up sanding it almost completely off with only the minute low areas having a spec of it on. This is one of the reasons that labor is so costly with good body workers.
Trust me, I have my man sweating bullets over any unnecessary putty on those fenders.LOL.