I might have the adress of the manufacturer that makes the neoprene glue we used to know under the name Black Magic and is now sold under all the main brand names : Cressi, Picasso, Seac, etc. Onfoy has been making that glue since 1970. It is now part of the larger company called Bostik...
It's
Onfroy (SA) RUE JEAN JAURES 77170 Coubert
Phone : 01 64 06 61 43
That's the adress near Paris. No website. This is gold information for some people. You are welcome lol.