How to season a rolled steel griddle?

I have a serious cooking gadget habit, and just bought a 36" flat top griddle. I tried to season it with olive oil, and got the top center to 525°, but the edges didn't color at all. Will a heating torch or some other method help me get the whole top the same color? Its too big to fit in my oven like a... show more I have a serious cooking gadget habit, and just bought a 36" flat top griddle. I tried to season it with olive oil, and got the top center to 525°, but the edges didn't color at all. Will a heating torch or some other method help me get the whole top the same color? Its too big to fit in my oven like a cast iron skillet. It pretty much works as it is, but i't ugly.
Update: RE: Put it in the oven. The oven is 26", and won't accommodate.
TR: Another oil. Ill try that. Guess I should remove what I can of the residue with Dawn and start over?
3 answers 3