It's a thick solution with many small fibres in suspension, these fibres stick together if they are forced through a small hole, the difference in pressure causing them to sort of lock together by friction between them. I use it as a preventative measure. If the hole is small it will last well but high speed running will cause the solution to leak due to centrifugal force. In its natural state it sits inside the tube or tyre as a gloopy liguid, rotation of the wheel causes it to be distributed evenly around the inside surface.

Get it checked and repaired sooner rather than later to be sure.

Cheers.

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