Hey guys! Thanks for the reception and for your reply!
Unfortunately, it's virtually impossible to get ITC-100 from a local supplier here in Brazil. Importing from an US dealer would have a prohibitive cost to me. So I think I will have to live without it (at least for the time being).
I'm thinking about either using the mortar without such coating directly over fibers or building a forge only with fire bricks. I've found some resources about forges built this way, however if instructions are available, I can't find a word about the results in production.
Do you think that the mortar will suffer in such way that I should not even try to use it over fibers without ITC-100? On the other hand, perhaps fire bricks will stand the high temperature, what do you think?
Regards,
--Ivan