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A properly maintained crown helps prevent moisture from penetrating the masonry and causing costly deterioration. Using a chimney crown sealer can be an effective DIY solution for small hairline cracks when the surface remains structurally sound. However, wider cracks, missing concrete, spalling, or separation from the surrounding brickwork require more than a protective coating. This guide explains how to prepare and apply sealer correctly, common mistakes to avoid, how often resealing may be needed, and when professional crown repair or replacement is the safer choice for your home.
