http://www.cnn.com/2011/WORLD/asiapc...lear.spraying/
According to the above link, a compound called Kuricoat C-720G will be sprayed on and around the buildings at the Fukushima site. From what I'm able to gather nobody really knows if this will be the answer to reducing some of the radiation nor is there any answer to what they do with it whether it does or doesn't do the intended job.