it should work , but if refering ot the cardboard ones like chicken eggs come in I be carefull cause if it gets wet it will mold, give out and you could drown the eggs. I personaly would use a piece of light disfuser( small plactic grate ) and do the same with it this stuff been great. I found it helped me when I hatched my bp last year and it prevented the wet stains on all the eggs from getting worstwhen I had them sitting on the medium direct.