Need some info ASAP. I purchased Thompson's Waterseal yesterday and coated three plywood boards, (both sides), that will be used for a new coop. I called the 1-800 number located on the side of the can to ask if this will be harmful to the chickens. Their answer was that unless the chickens will be eating off of the plywood, and consumed a large amount, that they should be okay. My father in law send an email to their site asking the same questions. This was their response, Currently Thompson's does not manufacture a clear finish that is FDA approved. FDA approval is important in terms of whether a product film is safe for incidental ingestion. We do not perform animal testing and therefore cannot test for ingestion. I believe it could be harmful. Upon this they suggested to call our local vet's office an I just finished doing so. The vet's office said, "It 's not a problem". Now what should I do? Cover the inside of the coop with an eco friendly product or attach 1/4 in plywood, non treated to the inside? So confused!! I would really appreciate a bit of direction, thanks.