I did this experiment myself years ago now and, surprisingly, it worked out rather well, even after four months of only being preserved with mineral oil.
In the video she says the coated eggs can last up to nine months, I’ve seen others say a year, and my experiment lasted 18 weeks because that’s how many eggs I had to experiment with. 🙂
Anyway, she offers some additional valuable tips that I wish I knew when I tried my own hand at this, though I do disagree a bit about not using store-bought eggs because my experiments showed there was a clear difference between the control eggs (those that were left uncoated) and those that did get coated with mineral oil after several weeks, if I remember right.
Here’s the video…