this is for any emulsion as far as I know:
the idea with the bead is that you wnat to use as little as possible. you want a nice thin layer. with different types of emulsion, and for commerical use, you will build layers, but you still want them to be thin.
anyways, don't worry about that. you only want one thin layer.
you are gonna use more than one bead, you are probably going to use several. just don't over do it. you want to start in a corner with a bead and spread it as much as you can on both sides, add beads as necessary and keep spreading. what I do is after I make sure that I have the whole thing covered, is to squeegee off the excess and put it back in the jar.
if you make it to thick, it is not going to expose properly and it will be difficult to wash out. then you will have to get remover and scrub it off, and start over. it is also in your best interest to use as little as possible becuase this stuff ain't cheap!
and it may take you a few times to get it right, don't sweat it.