All you need is the foam. Having experimented with that foam quite a bit I can say that it's really too stiff to use for dreads. It's a nice light weight foam, but doesn't have much flex. If you're wanting to stay with the Smooth On stuff, the FF6 is about the best to use. If you're willing to spend the money on a true self skinning foam, go with either the BJB or Kryolan foams. Both very good foams that will produce a quality, more realistic dread.
Brian