i'm laying a 22mm oak t&g floor-previously I have secret nailed to a ply sub floor,the supplier recommends using bona R850 glue and fix straight to existing floor,in this case well stuck marley tiles on a concrete screed-all well dry.just checking this is ok-the glue is water based,so I guess won't react with the tiles,which are firmly stuck,but not used glue before so thoght I'd ask...