Thanks for the link. That definitely showed a leak at the seam-between-the-halves. Either poor quality control when fiberglassing (probably), or something drilled in by a previous owner (hard to imagine what, in that spot, but we don't know).
I still wouldn't blame the very fact of two-halved construction. My boat was built in two halves (right and left), and it has not leaked there in over 40 years -- and that seam lives underwater
!. A proper fiberglass tabbing bond (to my mind), is as good as one piece (after all, even a single shell consists of layers of fiberglass cloth, so if they did not bond you'd have, like, four campers in one
I don't think that seaming together in the mold vs. seaming together out of the mold would make a difference on this*, but I do think quality control makes a huge difference (and, as I said before, seaming together while in the mold would probably tend to produce a smoother line, although that is not really important on a Boler/clone, due to the way the halves go together and the style of the belly band - as long as things aren't too far off).
Luckily, in an older unit, you have a good chance of finding out about this sort of thing before you buy.
Finding good fiberglass workers is a challenge as the job is smelly, toxic, and not "crafty" like, say, carpentry is (in perception anyway).
Thanks again for the link.
*That said, if they do it quick enough to have a chemical bond vs. a secondary bond, then I do think it would be somewhat superior. Although, a good secondary bond should be adequate for the stresses of a trailer. A good
secondary bond. I guess I'm back to quality control.
PS: I had to stop reading when he siliconed the belly band
, although it was a really nice job on the fiberglass repair.