Not really the best picture, but this is the corner on the top of the shower curb. Since the shower membrane starts out as a flat sheet, it needs to be cut to go over the curb. This means that the inside corner is unprotected on the top. I ordered a pair of these PVC liner inside corners from the Noble company to stick over these areas. They were a bit tricky to install, getting fully into the corner, but they should protect this corner from water leaking in.
Any adhesive/solvent used here?
the Noble Weld solvent or Noble Sealant 150 would have been used to connect the dam corner to the liner.