I have a syringe of solder paste that is leaded, no clean.
I've had it a while and don't use it very often. But I usually keep it in the refrigerator. Is that necessary? Or, can I just leave it my utility drawer with everything else?
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Keeping solder paste refrigerated will maintain the viscosity of the carrier and prevent the spheres of solder from settling to the bottom of the container. So, yes.
Honestly, I have never refrigerated my solder paste and have never had any problems. Just keep it out of direct sunlight.
I have been soldering 0.5mm pitch QFNs and 0402 passives for years.
EDIT: Also, I don't advise putting solder paste in a fridge with items that will be consumed.