In the 07 download database under player updates. There should be a pinned file on the firstpage called cyberface sweat alphas. It's basically some alpha channel images with sweat on them. Apply it to the alpha channel of your dds file and your player will display sweat in-game.
For the arms, if it's a 1x arm it is 256x256 resolution. Each arm is 128 pixels width, so when you make bands for one arm, only make it 128 pixels wide. If it's a 2x arm, then the resolution is 512x512 and you will need to limit your bands to a width of 256. Also, if you plan on adding anything like logos, words, or letters, one of the arm is mirrored before it is applied in the game, so the logo or tattoo would also need to be mirrored horizontally. I forget which side is mirrored, though.
Another question, can you put the sweat on her arms and legs?
I can put more then sweat on
her arms and legs, provided I like them.