What kind of flooring does your incubator have? (Mesh, solid plastic, etc.) If you have the kind of incubator that has a mesh floor and water channels/trays underneath it, I wouldn't recommend using the shelf liner. If it's a mesh and it's dense, the chickens will have a good grip and won't splay their legs (the reason to use a liner in the first place), and won't sink their feet through the openings either, so you're okay just with the mesh. I've found that this kind of shelf liner placed above the water trays blocks evaporation enough to affect your humidity. I'd read about lots of people using and recommending the liner, too, and put it in my incubator at lockdown last night, but it really messed up my humidity. I had a hard time getting it up high enough. The liner also makes it hard to see where the water channels/trays are. So... consider the big picture before you put the shelf liner in.
