For home use, the drying out isn't of too great a concern and a shot 
of flux will bring it back to life. Note the flux should be from the 
same manufacturer and if the paste is synthetic then the recommended 
flux should be used.

I used to work for a manufacturer of heart pumps and hearing implants, 
the daily waste paste would be scooped into 5lt buckets and at a later 
date sold to another small manufacturer who didn't have to meet class 
3 standards.

Keeping it cool and at  medium humidity (40 -60%) tend to keep it the 
longest. In a sysringe as air can't get to it, the keeping ability was 
much longer than the 3 hours for the screening machines.

Colin

:: I've been using the same batch of paste for months in and
::
:: out of the freeze with no noticeable degradation.  But your
:: mileage may vary
:: depending on your local climate.

 -- 
 cdb, colin@btech-online.co.uk on 7/12/2006

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