I'm on lock down, yesterday I sprayed the inside of my incubator (homemade!) with water and made sure all the water dishes were full. Humidity hit 65%, right where I wanted it to be. But after 4 hours it was back down to 45% I added my only sponge but NO change after an hour so I then added 2 rolled up damp washcloths. After only 5 minutes I had 100% humidity! Removed cloths and sprayed the inside surfaces of the bator. Back to 70% after about a half hour . Ok.... great I left it alone until hubby gets me this morning.... back down to 45%??? I add back one damp cloth... Almost 80% within 20 minutes so I decide to live with it. So far it has stayed steady for 4 hours. What do you think the issue was? Too much air flow? Not enough porous surfaces? And why would just one cloth keep the humidity this high? AGAIN, HOMEMADE INCUBATOR!! It's on my BYC page, but I do have 12 1/4" 'air' holes, that's not mentioned on the page. Not all are fully open, 2 have wires or tubing going through them. Thoughts?