well, I'm not sure where your going with that..
mud is an evil necessity the majority of the time..
what I will say is this... I may have insinuated it earlier in this thread... maybe not enough...
body work is a step of processes.. each process should be as fully completed as possible before moving on to the next... minimizing processes, and overlapping, till all are complete is important..
bringing something thru fill primer, than realizing you need to regrind and redo bodywork is not ideal...
layering product on product is not ideal..
putting dynaglass on top of fill primer is bad.. bodyworks #1 important factor is adhesion... not following the prior mentioned tips leads to improper adhesion and failed bodywork..
doesn't sound like your guy is bitching much about that, so that's good... hopefully it's looks t*t's in the end.. my fingers are crossed..