nJb wrote:
....


I would suggest colloidal silica instead of waterglass.


Is that not just the same stuff by different names?


We had a thread
about that when I built my kiln last year. One trade name is Kaowool
Rigidizer, made just for what you're doing. Also, using the pleated
process for lining the glory hole reduces loose fiber.

I don't know that process or I may have difficulties translating
it. Can you elaborate on that?

Paai