'Makrolon' springs to mind as the 'fibre glass' type stuff we used to fit to the outside of the 'B' skinned (soft skinned) vehicles during the bad old days in NI. It was, back then quite good armour. A lot of guys owe their lives to the stuff. It would arrive ready cut and moulded to shape but due to vehicle mods (winterisation etc) we would have to cut and drill to fit which was a real bugger of a job. Damn heavy stuff as well!!