Wiktionary
self-sealing
a. 1 A device with seals that activate without special procedures. 2 Describing a container that is capable of automatically closing off leaks that form in it.
WordNet
self-sealing
adj. capable of sealing itself as after being pierced; "self-sealing tires"
seals without the application of moisture; "self-sealing envelopes"
Usage examples of "self-sealing".
The big radial tires it rolled on were of the self-sealing type favored by dictators in small, uneasy countries.