According to the company's website "Lodge sprays vegetable oil onto the cookware, then bakes it on at high temperatures to create a natural, easy-release cooking surface for everything from Skillets, to Grill Pans, Camp Dutch Ovens and our Restaurant quality serving pieces." Hope this answers your question.
I'm not sure what they use, but a friend of mine, who's a chef, told me to cover the pan w/oil heat up the pan on a grill(because it will smoke a lot), then throw salt on it. Most people will tell you just to wipe the pan down with oil and heat it up. I can't exactly remember what the salt does though.
I used lard on all of the surfaces then teft in in the oven for 1 hour at 300 Deg. F., I shut the oven off after 1 hour with the oven door open for 15 Min. then I used paper towel to wipe it down and sat it on the stove, never use soap to wash it in use hot water, dry it out and wipe it down with cooking oil each time its rinsed.
You have received the answer already. Be sure and read the directions to keep it in pre-seasoned condition. You can't beat a good iron skillet. I will also say the ones from China will not stay good. I have had them and don't like them at all. You get what you pay for.