So I'm racking my mind over this. I have tried to season my de buyer carbon pan a number of times and once I cook with it the seasoning easily comes off with the wipe of a paper towel. I know how to care for these type of pans. I don't use soap I just use a non abrasive brush to clean but even with the wipe of a paper towel takes off seasoning. I have lots of cast iron and never have had this experience.