TERRA S Tire Sealant

[Traveller]

The factory tire sealant (Dunlop Tech) in my 991.1 had an expiry date. It was good for 4 years and has expired some time ago.

What about the TERRA S tire sealants offered at PP. For those that bought one, are they also good for 4 years from the date you purchased it?

FYI, I already have a very good tire repair kit as well. Just wanted to maybe replace the factory tire sealant bottle as a back-up.

Thanks!