That was most likely TC. I think he was extending sheet metal with glass though, which is the usual need. He hangs out at the MG Experience forum now, mainly in the MGA section. He's the man for doing hillbilly bodywork that looks not-hillbilly.
FYI, fiberglass resins will stick to steel and aluminum without much fuss at all. Make sure the metal is clean and rough it with some 60 or 80 grit. Stainless I don't know, but probably just as good. For extra grip, assuming you have room, drill a few holes in the metal and sandwich the glass around it.
Mating the materials is easy. Making the shape just right--that's the tricky part. Good luck.