Spent quality time with razor knife and acetone working on the shell seam of the Northern-Lite 10-2. This seam is where the top and bottom of the camper are joined together and runs around the entire unit. The original factory filler is still “gooey” and in place, but definitely in need of replacement. The difference is shown below (click the post heading to see the rest of the post). Used 3m 4200 sealant as replacement. This comes in 12oz toothpaste tubes which were challenging to manage, but once a squeeze, roll, spread system got going it was fairly easy.
Update: Finished seam, windows, taillights and assorted other areas that needed sealant replacement.