Hi Mark,
This is pretty straight forward profitable work. We have carried this out many times for clients and porcelain is one of the easiest ones to do. You shouldnt have to worry about bleed, but as always, a test patch is advised.
Not only for your own peace of mind but also to get client confirmation they like the colour now its on the floor/wall and wish you to proceed with the whole area.
It has always been the AquaMix range of product I have used in the past without any problems.