You add the priming sugar at the time you bottle. Otherwise, the sugar gets eaten by the yeast and all the carbonation goes out your airlock. You use the finings at least a couple days or more before.
The gelatin may drop out some of the yeast, but as long as there is some yeast left, it will carbonate. In theory, it might take longer, but I have not noticed a big difference.
The gelatin may drop out some of the yeast, but as long as there is some yeast left, it will carbonate. In theory, it might take longer, but I have not noticed a big difference.