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How can i re-seal double-glazed doors/windows?

Original sealant is heavily discoloured and/or coming away. Which sealant can I use to re-seal on both inside and outside frames? Will Unibond Super all-purpose do the job? Or is there a proprietary sealant specifically designed for sealing double-glazed units? Replacing the units is definitely not an option.
Rog, December 2009