I'd be curious to hear as well, I've got a serious FF habit.

Arrow fletching powder is supposed to work, and something that boat builders put into epoxy is supposed to work....I bought some back when I first learned of it a few years go but off the top of my head can't recall the substance....anhydrous silicate maybe? I probably have that wrong. At any rate, I've tried several of these over the years and didn't find them as effective as FF. I'm sure there's something out there to do the job, however, and I'd love to hear about it.