Moisture curable extrudable polysulphide sealants comprise the reaction product of (a) a silanized polysulphide obtained by reacting an SH terminated polysulphide with a silane having 2 or 3 hydrolyzable groups and 1 or 2 groups capable of reacting with the SH group in order to cover up to 30% of the SH groups with the silane and (b) a disulphide containing the group IMAGE group wherein het is an O or S atom or N-organic group. Other moisture curable extrudable sealants comprise the silanized polysulphide (a) and an ortho ester e.g. triethylorthoacetate.
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