I have used the 'mechanics' paste from DX for a number of projects and
it works well.  It's been in the fridge about 1 year and still comes
from a syringe needle after warming it up, but is noticeably more
viscous than when new.  The solder paste does unbridge itself and
center small components with surface tension.  Don't use an excessive
amount on the pads and you should be OK.  The best way to apply it is
to cut a stencil from transparency film, or have one made, but for
one-offs syringe application can be sufficient.

On Wed, Mar 24, 2010 at 6:44 PM, solarwind <x.solarwind.x@gmail.com> wrote:
> On Wed, Mar 24, 2010 at 4:52 PM, Mark Rages <markrages@gmail.com> wrote:
>> I've used it. =A0Works well.
>>
>> This one seemed to go on a little better:
>> http://www.dealextreme.com/details.dx/sku.7952
>
> Thanks, I'll buy that one then. How long do they typically last in the
> fridge? Also, is it reasonable to apply evenly across the surface
> mount pads on the PCB (so that the paste bridges the pads) and simply
> heat it with a hot air gun? Will the paste "unbridge" itself or will
> it melt and stay bridged?
>
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