I would like to mortar wash my brick FP. However, I want to test out the technique on bricks ahead of time. I know I can find individual bricks to test this out on but is there a product that can be bought to test out this technique where the bricks are mortared together already? OR what tips do you have on how to test out this technique? Any advice is much appreciated! Don't want to mess this up. I am confident I can do the technique and don't feel the need to hire out someone- just want to practice first.