Yes the bathroom can be a bad place, most especially if you don't have a ventilation fan. As to Camilla oil, I find any oil that on a blade could indeed trap moisture under the oil hence creating a much bigger problem . This is why I encourage most to properly dry their razors before putting them away. After a thorough drying, then leaving open for a few hours, mine usually stay open till the next days shave. Here in Memphis we deal with a lot of humidity, but so far it has worked. So if the bathroom is tihe culprit, the airtight seal you are using will do the job, or just move them out of the bathroom. I,m not alone in this only drying and leaving out, but do what works for you, cause I do what works for me and the heck with what everyone else is doing. Tc