The correct product is called Tonsil, if memory serves. Its a two part product for glueing plexiglass. Quite expensive. You can make your own glue using Ether and dissolving some offcuts into it. This is what they used in the War. Of course Ether is not sold over the counter in Britain now, as you might be a pervert! I am known for driving Schmitts with old dead domes glued together, well I was, not driving any schmitt these days!.