There’s a debate over which is a better carbon steel seasoning process for de Buyer carbon steel pans due to the epoxied handle. Most people season from the manufacture instructions, which can be good but, I have found is a little harder for most people to get right. I like the oven method better and will show you how to do it in this video.
de Buyer does not recommend putting the Mineral B in the oven because there is a chance that you can ruin the handle. This is true and I have done it when I have put the handle way too close to the element. Following the method that I use here works very well, and I have never had an issue doing it this way, but there is a chance that the handle could discolour or even bubble. if this happens, it would not be covered by their warranty. As you see, I invert my pan to allow the handle to be as far away from the element as possible, so I do not cook with my Mineral B pans, only season.