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I has the same problem a few months back where I was asked to veneer over an inside fireplace made of brick. Although the project never amounted to anything , I was concerned that the type of brick I was up against wouldn't hold my scratch coat well enough. Some bricks have a smooth surface while others have a "gritty" feel where you can almost rub off particles of the brick , like a fine sand.
Since I had these concerns, I figured the only way to warranty my work was to screw a metal lath onto the brick and then apply my scratch coat.
Maybe someone else on this site has done this application before and can shed a little more light on this subject.
I would try it on my own house but to do a neighborhood entrance without knowing the best application might be a bit risky.
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