Hello, Please can someone advise me as to whether I can use Vitrex tile sealer to seal the grout in my shower? I already have a bottle of this product that I use on a travertine floor in a different part of my house. The shower has large tiles and I would prefer to paint the sealer on rather than use a spray version and save a few bob in the process. I did contact Vitrex about this but I have not received a reply after 3 full working days. Thank in advance for any replies.