Also- and the masters will tell you this, won't they, DOOG?
Seam defeat is 90% before they join, and 5% after. The rest is luck. Kind of like sex.
Don't base your victory on cleanup, base it on clean building, again like um...
Really.
There is a trend in publications to talk about fill/sand/prime paint which is all well and good, but...
Put it together carefully and correctly, and in almost all cases the rest is not necessary.