oldhouse First of all, you should follow the guidance of the supplier, vendor, retailer/wholesaler from where you obtained the tiles. Secondly, what type of backsplash? Thirdly, a wet saw is sooooooooooo much cleaner -- no dust. Sealer type is dependent upon the type of grout you will be using and the finish on the tiles. The supplier knows what is required for your specific products as he can see, feel, smell, taste, touch, lift, fondle, and carress them.