What the old shell is telling you
There is a real difference between a surface that has worn out and a structure that has failed, and the fix is not the same. Fine surface crazing, staining, rough plaster, and tired waterline tile are finish problems. A crack that runs through the shell, follows a consistent line, or reappears in the same place after a previous patch is a structural one, usually driven by the same clay movement that shows up in slabs and foundations across this county. Resurfacing over a moving shell buys a few good seasons and then reads the crack straight back through the new finish, so it is worth knowing which one you have before choosing materials.

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