Satanite is just a refractory mortar that we use for stabilizing the fibers and adding some robustness to the forge walls. It has the dual benefit that it can also be used for clay coating blades as well.
ITC-100 is a highly reflective refractory coating used to improve the efficiency of a forge and come up to temp faster. ITC-100 can be used to stabilize the ceramic fiber blanket as well, however, since it's more expensive (but worth every penny), conventional wisdom is to base coat with Satanite first and then top coat with ITC-100, that way you can use significantly less of the ITC-100.
If you want flux resistance for your forge, neither of the above two refractory coatings will do the trick. In that case, I carry a Bubble Alumina refractory coating that will give you good flux resistance for an Inswool/Kaowool lined forge. It's not on my website yet, but I'll be adding it during the next update...I took a bunch to Blade and sold out of every bit of it...
-Darren