You need to get the brew off of the trub before you use finings. Most of them work by binding particles & proteins and the trub has a lot of particles in it. To get really good results, rack a second time, then add the finings. I've used them a few times, they worked.
Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"
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