As it happens I just spoke to Cuprinol here in the UK about use with bees. I asked about Cuprinol Clear and Cuprinol Green. They said that treat the wood as per the instructions on the can and allow six weeks "airing" time before installing the livestock (thats both products). The web addres is "http://www.cuprinol.co.uk" and they have some info on line but I couldn't find any Bee related so I rang them and got a very good response the info was given to me within a couple of minutes. TTFN Les