Hi! We put it up in our first house and LOVED the look! Just like you, it was actually tile made to look like old brick. The manufacturer was Simons and it had "SIMONS" and "1926" stamped on some of the bricks. We did it with grey grout and purposely had the installer keep some grout drips over the brick to make it look old. We first installed it just as the backsplash and then ended up doing an entire wall. To answer your question, we did not seal the brick but just used soap and water when grease, etc. splattered as needed. It worked fine - never an issue! Good luck!
Q
tiny powder room in laundry room
Q