I was just telling you what works for me. I'm sure you could shake it after adding it into the fermentor, but you could risk oxyidation depending on your setup. I work under the assumption that Biofine works like food coloring. Shaking will disperse it more quickly, but everything will change color if I wait a little bit. I also figure that adding it as I cold crash means all the heavy shit will be heading in the right direction (to the bottom of the fermentor) and I'll have to wait a bit anyway.
None of the instructions I have say that it needs to be mixed well. I sanitize a teaspoon for a bit and then pop the airlock off the top of the carboy, pour a tsp on top of the finished beer, put the airlock back in place, and then drop my temp.
After about a week I rack to the keg for any conditioning that may be required, or just carb and drink.
Below is a picture of the Mexican Lager I just kegged on Sunday, used 1 tsp in each 5 gal carboy at cold crash.
Like I said, it works for me.
~widget