Thanks for that interesting post DWS.
I worked a fair bit with fibre-glass in the past and found sanding to be very unpleasant and there are now various health concerns about it too!
I would be very interested to know what Health and Safety precautions the repair team in this job (complete with their "sanding discs!") will have to take...will it cause the itching that Fibre-Glass does, is the dust hazardous, that sort of thing?