In wine making, before fining, the instructions always say to stir out all CO2 before adding finings “degassing”. The instructions say that Failure to degas will result in wine not clearing. So, when transferring beer to a keg (and adding gelatin as a fining) is it better to just purge the O2 out and then let the keg sit for a few days to fine BEFORE charging the keg with CO2?