Cast Iron Help

I need some advice from you iron experts. I picked up this Wagner Ware Bacon and Egg Skillet, at a local Antique Mall. It needed some loving, had a lot of build up and some rust on it. I attempted to remove it then re-season. Well, as you can see, I now have these "spots" on it, seems the oil didn't take.
Do I need to strip it again, it so, what methods do you recommend?
Thanks
Do I need to strip it again, it so, what methods do you recommend?

Thanks