A quick question about rigidizer

[Dr Feelgood]

I cant seem to find an answer for this anywhere.
Im just ordering a bunch of supplies and I have rigidizer on the list.
Its for a standard propane tank gas forge.
I want to give the thermal wool a good soak with the rigidizer.
About how much should I order ?
Ive got 5 litres on the list but that seems like overkill.
Thanks again !

 

[lastbrunneng]

I used a pint of the stuff for an 7" x 12" interior.

 

[Stacy E. Apelt - Bladesmith]

1 litre should be plenty.

 

[C_Claycomb]

Or you could buy colloidal silica and mix up your own. That is what I did, and I still have a lot of the powder left, but it is lighter and easier to store than liquid rigidiser.