Doubt anyone wants it due to difficulty of moving aerosol by post, but, going free:
one new can of ambersil formula 5 medium duty non-silicone mould release.

Purchased new a few years ago then never used it.

Free if you can collect it from Reading (near the uni).
Via royal mail i think it would have to be shipped with tracking (aerosol restrictions) and you would pay any postage free.
Due to the above, UK only.

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AFK with real life, still checking PMs