I need to seal and improve the colour of the stone flagged floor in our kitchen. I'm fairly certain that the flags are sandstone and have cleaned them using Lithofin so they now look very clean but a little dull (slight understatement there). Can anyone recommend a method of sealing and enhancing the colour of the flags? I've seen lots of recommendations for linseed oil on limestone and slate but no mention of sandstone. Would linseed oil be the way to go?