Cab-0-Sil Advice ??

Inspired by the several posts on the merits of Cabot's Cab-0-Sil
TS720, I ordered a quart.

Now my question is, what the hell do I do with it? I've never used
Frog's Fanny.

I got the impression it's "painted" on the fly with a brush. Correct?
Does some of it actually stick to the fly, even being cast a number of
times?

Is it possible to buy a pocket-size bottle with built-in brush, for
carrying in the vest?

Does the fly have to be re-treated after catching a fish? If so, does
one have to carry the hydrophilic version as well, for drying flies?

Is it used the same way on nymphs?

Thanks. vince