I recently found some very old rusty cast iron pans and decided to clean them for use. I managed to get most of the rust off, and seasoned them. They came out really sticky. I used vegetable oil (just rubbed it on with a paper towel) and put them in the oven at 500 degrees for about 20 minutes. I did this two or three times with each pan (recoating and heating in the oven).
I just know I screwed something up because they're not supposed to be sticky. I'm not going out to buy Crisco to season 3 pans. Should I scrub them and start over again with the vegetable oil?
I just cleaned and seasoned an old one. I sprayed it with oven cleaner and put it in a plastic bag overnight. Tie the bag so it doesn't dry up. The old layers will come right off with an sos pad. You won't need to scrub it forever. I did use crisco on mine but vegetable oil is fine. I baked it upside down for 1 hour at 350. Then let it cool in the oven. It turned out perfect.
I'm thinking maybe you used too much oil and too high heat.