Before we have self-healing cars or buildings, we need strong materials that can fully self-repair in water-free environments. Self-healing materials work very well if they are soft and wet, but research groups have found that the ability to self-repair diminishes as materials dry out. Scientists are beginning to bridge this gap with rigid materials that can repair 99% of a cut on the surface in semi-dry conditions.
from Engineering and Construction News – ScienceDaily https://www.sciencedaily.com/releases/2016/11/161110152834.htm
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