Matt:
Regarding the oils, there are way too many oils that can do seasonings, and most seam to work, but the longest standing one is Flaxseed, so that is what i used. I only have one really old cast iron which is a Dutch Oven dated around 1850-1900, which has a great long standing seasoning(which Im still debating weather or not to polish). The rest are quite new, which have the factory seasoning, this seasoning is not very appealing due to the coarse nature of the surface which this type of seasoning has to be applied. The grinding/polishing/sanding was done to eliminate this rough surface, not because of the seasoning or rust. Most recommendations on the net are to heat between 300 and 400, so I choose 350. Its also recommended between 3-4 cycles of seasoning to build up a hard coat. I do agree that there is also a lot of wrong info on the net and the self cleaning cycle for sure is one of them.
I just wanted to share my new found hobby, i hope it didnt derail the original topic. Well its new found because I got an Induction cooktop and my old aluminum pans just dont work.
Felipe