RE: NEW KMP 95" B-25
Hey 757...
THere are lot's of places on these forums that have gone over the use of microballoons (try a search!), but you will NOT be forced to glue the wing together.
Once you get the outer panels to fit like you want with the new joiner system, just place a layer of Saran Wrap across the face of the nacelle rib (with lot's of "extra" overlap) and tape it in place. This will keep the MB/epoxy mix from sticking to the nacelle.
Next, run a layer of quality masking tape (3M Blue is great) around the outboard wing panel at the inner rib to keep the MB/epoxy off of the wing panel. You might even use paper to mask off the entire outer panel if you are messy like me!
You will mix the MB's in with the epoxy (about 1:1 is a fine ratio) and mix the whole thing together.
Put the center section up on one end.
Slather the mixture onto the face of the root rib (keep it AWAY from the joiner!) and slide the panel down into the nacelle. As it mushes out, just scrape off the excess and wipe the area with Isopropyl Alcohol to remove the residue before things dry. Once the mixture sets up, just pull off the panel and finish sand (leave the tape on while you are sanding to prevent getting into the paint).
Should be a pretty nice seam after very little work!
Do one side at a time so the mixture stays where it should. You can use 10 or 15 minute epoxy since the areas are not structural and it will go fairly quickly.
Those MB's REALLy make the epoxy easy to sand.
Keep asking questions - that's the way we ALL learn!
Good Luck