ORIGINAL: ChuckW
I like it. I've used BB's and epoxy before but the idea of havign something that can be appied in a thin layer over a larger surface area could come in very handy at times.
Yes, it is so fine (finer than micro balloons) that you get much more weight in a smaller volume than with BBs or shot, and it can be the consistency of a thick paste or a thick paint, depending on how fluid you need it to be.
If necessary, you can make molds and shape it, as you would led, as well.