Lee Valley = Danger!!
Just a note here, that there are two different types of seam covers on Bolers.
1) A foam tape (used on a majority of Boler
13s and most* Scamp
This was originally a double-sided-adhesive foam tape, to which they applied talcum powder on the "room" side, to cover up the sticky. One can now order similar one-sided tapes, so no need for talcum. Scamp
does sell a one-sided seam tape, and U-line has several varieties too.
2) A "hard" plastic T-type molding (used on some Bolers and also the original Trillium
13 and 15s).
This involves a small, "U-shaped" female track that is glued to the camper walls in the seam areas. Then a T-type molding is "snapped" into place from the room side. From what I can tell, no-one has been able to find this exact shape of "T-molding," although several people have modified the currently available T-moldings to work decently.
*I would have said "all" Scamps, except that I have seen some mid-'80s Scamps with a woodgrained color seam covering, and I don't know if that is just brown tape or if it is another product.