Speaking of protecting things a few days ago while driving mum around shopping I spotted some 'Fire Blankets' in a neat pouch at the local clearance shed. I pulled one out to have a look and seemed to be a very tightly woven glass/kevlar blend, quite flexible and about 3/32" thick. Made to be placed over a stovetop fire but would be handy anywhere to stop weld spatter. On my shopping list for next week.
How big is this folder? Are you making tanks?