I've got an IPA that just won't seem to clear. I've done the standard cold-crash/gelatin fine, but it's still a bit cloudy.
Should I try for it again?
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There's certainly no harm in trying it again. Any gelatin you add will sink to the bottom regardless of whether or not it takes any haze-causing particles with it. In my experience, different beers have vastly different requirements for fining, some needing several times as much fining as an easy-to-fine one.
Some things about IPAs and haze:
That being said, I'm not particularly sure from my own experience how well gelatin will work in these specific cases, but I don't see the downside in trying.
If you have already gelatin fined your brew once, then it may be that the haze is not being caused by yeast in suspension, which gelatin is intended to tackle.
A possible alternative is that your beer is hazy due to long proteins in suspension and a different fining agent is required to tackle this issue. Polyclar is one such agent and can be added after fermentation in primary / secondary.