Thank you buzzkill,
I understand that the refractory coating will suppress ejection of fibers, provide that I am perfect, and do not puncture the coating.
I know that the very first chunk of steel I place in the forge, will miss, puncture the refractory, and send a cloud of fibers out of the forge (but that's me).
Conversely, the ceramic wool has 'solidified', as stated by devil-forge.
Have installed all items in accordance with manufacturers instructions.
Am contemplating - removing it all,
install new ceramic wool, rigidizer, kastolite30 (or equivalent).
Best Regards,