self-sealing

(not comparable)Describing a device with seals that activate without special procedures.

The engine had self-sealing gaskets to keep the grease in, just tighten the bolts.

seals without the application of moisture

(not comparable)Describing a container that is capable of automatically closing off leaks that form in it.

Many pilots' lives were saved during World War II by salf-sealing gas tanks that kept their planes from becoming fireballs when riddled with bullets.

self-sealing tire