I'm not sure. It depends on which dwarves you encounter; some of them are greedier and keep their secrets closer than others. I wouldn't try too hard with any that already seem biased against humans. If you find friendlier ones , giving them something in exchange would probably help.
Specifically, you might have better luck with the dwarves of Erebor, or Gimli, if you can find them, because they've had more alliances with humans and a little more experience outside their own traditions, in general.