I am repairing some crumbling mortar joints on my window sill. As I remove the old mortar I notice that usually the 1/2" of mortar before I reach the window caulk is in good condition. Do I have to remove this 1/2" of old mortar right up to the window caulking or can the new mortar dry against the old mortar here? I'm just wondering about water penetration. Thanks
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