I think I'm going to have to find a new "go-to" ink. I've been using the Uni Jetstream for years now, but I'm finding out that some of the older Jetstream pens have their inks mysteriously drying out even though the refill has more than half ink left. The odd part is usually the new Jetstream pens are fine, but the older ones tend to be a hit or miss.
It's kinda frustrating since I was pretty happy with how fast the ink dried with no worries of accidental ink smears. I guess that's the trade off. They dry out over time, and no amount of soaking in hot water will fix it. Ugh.