Questions & Mysteries Why didn't Oden use haki while he was boiling?

I am not sure why you think his haki will help him out in that oil soup burning 1000s of degree temprature ?
While with Haki you can touch and block attacks of Akainu who have far more AP then a oil soup and also have more degree temprature.
I think at least 30-40min using of full body haki could at least let him able to survive the oil soup without much taking damage.