Repairing a crack along the edge of a chimney crown


My chimney crown has a crack along much of the bottom edge/perimeter, right up against where the crown meets the bricks.I understand from reddit and other places that rather than pay a huge amount of money for a mason demo and rebuild the entire crown, that I can use a brushable crown repair substance (like this or a product called CrownCoat) as an over-the-top DIY to fill it in.My question is though: Will that be effective if the crack is right up against the seam with the bricks? Or is a substance like that only for when the cracks run vertically up and down, with crown material already on both sides of the crack. via /r/DIY

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