For you last question, the only way to really tell if it will make a good difference, in your opinion, is to do a test spot and compare the two side by side. After using the NXT wax, tape off a section and then apply the caranuba wax that you are using. Look at the two next to each other and decide if that it the look that you are trying to get. Also, for me it is easier to tell on flat surfaces, I usually try things on my trunk or hood. There was a post that talked about this, I'll see if I can find it.
Edit: Here is the link, again from the information station:
Edit: Here is the link, again from the information station:
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