When I glue the fusalage together, I do it in small sections at a time. I use Tenax 7R and an applicator. Berfore the glue has a chance to fully cure I push the parts together causing a little bit of the glue and melted plastic to ooze out. After I have completed the fusalage I take a new #11 blade and trim off the ooze. I then touch up with gap filling CA on any bad spot. The overall result is very little seams or gaps and very little sanding. This will work on a model that has a good fit to start with. A kit that fits bad may take a little more CA to fill the gaps. In that case follow the above mentioned advise.
Berny
Phormer Phantom Phixer
On the bench
TF-102A Delta Dagger, 32nd FIS, 54-1370, 1/48 scale. Monogram Pro Modeler with C&H conversion.
Revell F-4E Phantom II 33rd TFW, 58th TFS, 69-260, 1/32 scale.
Tamiya F-4D Phantom II, 13th TFS, 66-8711, 1/32 scale. F-4 Phantom Group Build.