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Bruce[_4_]

wrote:

course it does, it tells you if it sets like rock or not.

Even if it has lost 90% of its strength, it still feels as though "it
sets like rock".

You just don't know, and anyone who claims they do is telling porkies.

But Adam said its been a few months in the lounge, so no worries
there! You can keep cement a few years in dry storage and it still
sets hard.

A room with 50% - 70% humidity is NOT dry storage. And as I pointed
out above, cement that appears to you to be "setting hard" can have
lost as much as 90% of its strength. Furthermore, its capacity for
watertightness will be severely affected.

Cement is not that expensive, certainly not worth taking this sort of
a risk on. Except if you don't know what you are talking about, so
please feel free go ahead and use the stale stuff, as you will be none
the wiser. ;-)