What can't JB Weld do? It's the metal glue that works wonders, and has left dozens of flat surfaces around my workshop with a swirled glop of grey permanently affixed. This is rarely the kind of thing ...
Actually, it seems to be a composite material, not sure if it's plastic. Someone was a bit too heavy for a chair here at work and cracked the seat. It's a $1200.00 chair, so I saved it from the trash.