Because of Leonardo's meticulous process, his Last Supper quickly began to decay, and has had to be restored numerous times.

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Leonardo used an experimental technique of applying paint directly to dry plaster instead of the traditional method of applying wet plaster to the wall and painting on it. This caused the painting to deteriorate quickly and required restoration work to be done numerous times.

Because of Leonardo's Meticulous Process, His Last Supper Quickly Began