Has anyone used the Norton flattening stone, and if so, any opinions are appreciated. I have a Norton 4k/8k, but the necessary materials are in short/no supply here in a remote corner of Kuwait. I was considering purchasing the NFS from Amazon, because the wet/dry sandpaper and granite tiles/glass panes aren't exactly in abundance here, and those that have are a little stingy (with good cause though). Any suggestions are appreciated.