Hi Derek,
I use WELDBOND for gluing plastic windows in model aircraft -- its a Canadian glue that readily
available at your local Aussie hardware stores -- Mitre 10 , Bunnings, etc
Its a white colour but dries clear, it not a rapid drying glue however, takes about 1 hour to set, and 24 to complete the
drying process. Its not a PVA glue.
Cheers,
Brett