The best way to repair stucco siding is to remove the damaged section and then replace it with new stucco. You can use a patching compound to fix small areas of damage, but it's important to make sure that the new stucco is well-mixed and applied in thin layers so that it doesn't crack. You should also seal the repaired section with a coat of paint or sealant to protect it from moisture.

There are a few ways to repair stucco siding. You can patch it with new stucco, or you can use a sealant to fix any cracks. If the stucco is severely damaged, you may need to replace it altogether. To patch the siding, mix some plaster of Paris with water to make a thick paste. Put the paste over the damaged area and smooth it out. Let it dry completely, then apply a coat of paint or sealant to protect it from weathering.