Fix-a-flat or Slime

[Shmoov69]

So, my wife's Escalade has a slow leak around the rim. Like every few days I have to add air. It has chrome plated aluminum wheels and the chrome is pretty crappy (on it when I bought it) and it is flaking off randomly and I believe that the bead won't fully seal because of it.
Will either fixAflat or slime work for something like this or will it eat the wheel?
Thanks