I used two packets in a cup of water this last time. It seemed to do the trick, and thinner is easier to work with. You also want to periodically add a bit of water to the glue, it seems to need that. I think some stuff in the sinew dissolves in it when you dunk it in, and that and the evaporation makes it thicken. Also very important to add the Knox to cold water and let it hydrate, if you add to hot water it clumps and is a bear to get dissolved completely.