Knowing the Limits

Self-healing materials are not magic. Most only seal hairline cracks, the kind a fingernail would barely catch. A wide split or a snapped beam is still a job for repair crews.

Healing also takes time. Bacteria need days to weeks of damp weather to grow enough limestone, and glue-based systems heal best on slow, small damage rather than a sudden hard hit. The real payoff is quiet, early upkeep: stopping tiny flaws before they ever become big ones.