Hello All, Greetings from a remote area of the Southern U.S.! Many products will serve to protect concrete but when paint/epoxy is involved I recommend acid etching. Concrete will *dust* without a sealer which is not allowed in honey processing areas by U.S. honey house codes. honey will eat up the concrete when unsealed but takes awhile and if honey is not allowed to stand quite awhile. If you are going to use a powerful power washer to clean the honey house I recommend the best epoxy you can find for concrete floors and not the water based epoxy but only my opinion. Bees are flying today. Problem in Missouri I reported on about ten days ago was coumaphos resistant varroa but as with fluvalinate resistant varroa only now in about every third hive. Good luck to Yoon in his upcoming replies! Will answer replies on my return in late Jan. as only using a friends computer! Sincerely, Bob Harrison :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: -- Visit www.honeybeeworld.com/BEE-L for rules, FAQ and other info --- ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::