Notubes the solution tyre sealant award winning tire sealant from the folks that invented tubeless conversion and redefined puncture protection unlike other tire sealants stans tire sealant is a very thin low viscosity liquid that coats the inside of the tire and carries with it specially formulated sealing crystals the low viscous nature allows the sealant to quickly reach the puncture site and the crystals aid in sealing large holes something which thicker or foaming style sealants canno