The present invention is directed to a plug for sealing a puncture in a tyre, whereby the plug comprises a head portion and a tail portion, the head portion comprising: a porous material that comprises open pores and capable of absorbing >0.02 grams of water per gram of porous material; and an accelerant selected from the group consisting of a salt, a polar solvent, an acid, and any combinations thereof, wherein the accelerant is retained in the pores of the porous material and is configured to react on contact with a curable sealant selected from the group consisting of anionic stabilized sealants, steric stabilized sealants and anionic colloidal dispersions thereby reducing curing time of the sealant, and wherein the porous material does not comprise the sealant.