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A traditional German schmear uses mortar, making it unsuitable for adherence to painted surfaces. Professionals recommend removing any existing paint before applying mortar. However, you can rough up the painted surface and clean it to test if the mortar will stick. Remember that the underlying paint's texture and color may affect the schmear's final appearance—so starting with a bare brick wall will ensure the ideal finish.

Some cracking in bricks is normal, such as when a foundation settles. Keep a watchful eye though, and alarm bells should start ringing if new cracks appear or existing cracks lengthen or widen. Temperature changes, moisture, and structural loading can all contribute to cracks in bricks either starting or getting worse.

Cutting stone comes with a number of safety hazards. First and foremost, if you’re not comfortable with the equipment required to cut stone, including blades and grinders, you could easily injure yourself. The heavy machinery also poses a risk to your ears if you don’t wear proper ear protection; similarly, you need to wear eye protection to keep debris from irritating your eyes.

However, the biggest risk from cutting stone comes from the stone dust. When breathed in, stone dust can be a huge hazard to your lungs. Always wear a face mask when cutting stone to prevent inhaling stone dust, and thoroughly clean the work area when you are finished.

To avoid injury, we recommend hiring a stone-cutting professional, rather than attempting this job yourself.

You will repoint over a fraction of the old mortar, but you should scrape away 1/2 to 1 inch of mortar from the joints before repointing. Otherwise, the repointing is only masking the weakened mortar instead of actually replacing it, which could put your chimney at risk of bigger, more expensive damages later on.