I wasn't aware that Pactra made rubbing compound? Never saw it on a hobby shop shelf. I regular automotive rubbing compound, No.7 I think. Any kind of light polish should work. I think in Windy's video he used the auto compound to start with, and finished with Gorham" Silver Polish. Head down to you auto paint supply store, tell 'wm what you are going and see what they recommend. Sometimes it's a matter of what you have available and can get easily locally.
   Type at you later,
    Dan McEntee