I just seasoned a cast iron waffle maker. It now has a black residue that is flakey in the thinner spots and somewhat sticky where it is thicker. Should I just bake it longer, start over again, or something else?
You might consider removing all that seasoning with oven cleaner and starting over to get a thin, even coating. Thick, gummy seasoning is not going to perform properly.
These are the best instructions for cast iron seasoning I know, using multiple very thin layers of flax seed oil: http://www.youtube.com/watch?v=xoIO8YOpyN4