I use an Solid color Boarder, Most Pros euither use Crystel or Solid color board.. But what about you?
Jesus the guy is asking a question and you people are saying "I don't use a border" "I don't have one" etc. Just answer the ----ing question. Make a new layer, top of all others, CTRL+A to select the canvas of the sig, go to: Edit > Stroke. Use default settings, but change the colour to black and use 1px to make a solid border.
Dont ever do that. Borders pretty much suck so I would stick to not adding one. Unless you feel it really suites the sig.