Craft Bag of Cement
In the UTILITY category at the chem bench. Latest version fixes the fibreglass to reference the proper component rather than the misc item which would make it appear uncraftable.
+ 3 Ceramic
= 1 Bag of Cement
= 5 Concrete
because thats what you have to deal with in the wasteland.
its like everybody forgot (or maybe millennials dont even know…) that asbestos used to be everywhere back in the golden age. ceramic on its own is brittle as shit, it must be strengthened with fiberous material. im guessing that a lot of people have no idea what asbestos really is anymore. kinda like cassette tapes and manual transmissions. also remember that the ovenmitt scraps into asbestos. so literally, everywhere.