Is it better to season a humidor with distilled water or 50/50 propylene glycol solution?

Distilled water only!! if the Humidor is new then you want to season the Cedar wood on the inside take a water Mister bottle fill with Distilled water Completely drench all the walls inside and close the lid and let the water absorb into the cedar do this several times a day for a couple of days Then let the humidity get to the level you want slowly by opening the lid and closing it then you can use your hydration pads and it will hold consistent humidity depending on how much you open and close it if you use anything but distilled water it will make your cigars taste bad if they are left in there to age