The answer to this is not so simple. The key factor is the type of porcelain used. Porcelain tiles have changed a lot over time and today there are a variety of differing standards associated with them. The first generation of porcelain tiles were actually so dense that sealing was not required at any stage. However, today, not all porcelain tiles in the marketplace are so impervious to water and other liquids.So, what do you do? Well, you need to do a simple water test on your tiles. Add a few drops to the tiles and if they appear to absorb water then we would recommend that you seal them. There are many different products around that can do the job but one of the best is Sealer’s Choice 15 Gold Penetrating Sealer. You can’t really go wrong with this product.Copyright Ian Taylor and The Tile and Stone Blog.co.uk, 2013. See copyright notice above.