Like CBA said, its not so much daunting than tedious to flush a sac pen, and I'm not really the type of user who'd switch out inks often either, except for the phase that I go through a few for each new pen where I try to decide which ink I want to use for that pen/nib by testing it on my usual paper, before committing to one permanently. Even that is rather time consuming, given how many flushes it takes to completely (if even possible) clean the ink out from the sac.
)
There are some inks with bad rep for melting sacs on their own, but keep in mind that even a safe ink might give problems if it's mixed and reacts with the residue of another safe ink left in the sac. For that reason alone, I'm inclined to stick with just one ink for such pens, and I do the ink switching mostly on C/C pens that can be flushed easily with a bulb syringe.
I agree with giving dip pens a try too. Like terrpn said, flex at its best, for little money. I found that its a good way to up your game with flex writing given how less forgiving such nibs are on your pressure control. After an hour or two acclimatising to a dip pen, it conditions your muscle memory enough to exert pressure at the right strokes that it carries over fountain pen use; I was very surprised to find how much easier it is to use my 912FA in comparison after that.
The ZebraG are fairly nice; their popularity is mostly due to how they can be fitted into Jinhaos and Noodlers to make frankenpens, but they will corrode after a short while and will need to be replaced. I haven't had much experience with other dip nibs, other that the brause ef66, which is fairly decent as well.
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great post
staying with one ink is fairly important at least in the older latex sac pens cannot be stressed enough, but please know that i have done "that exact thing" and my old latex sac pens are still pliable after 20 years and hold a fair amount of ink
great point on the zebra chrome/steel nibs.............they will corrode big time. i ordered some of the gold colored (titanium) ones, which are a little more pricey, but hopefully will not corrode?
i have every once in a while do a water rinse with a little silicone lubricant for the sac if i feel it hardening up, but then you have to go back and do a water rinse with a couple drops of soap to remove the lube from the feed.
i wish more people would purchase and use the older-vintage sac pens, but i do understand and respect the reason for being apprehensive or go in another direction.