Dry Brining when your store-bought rub has salt in it

[Spinaker]

I would apply the rub, sparingly. You do risk over doing it with salt, but I wouldn't worry about it too much. Unless the rub you are using is really heavy on salt.

[Suave Dave]

I was in Austin recently and bought myself a bag of rub from Iron Works. Upon further inspection, I discovered that it has salt in it. The problem is that having been convinced of the virtues of dry rubbing, I have a couple of butts sitting with a good sprinkling of salt on them right now and intended to hit them with my new acquired rub, just before I put them in the smoker. The questions are am I risking over-doing it in the salt department if I do this, do I reduce the amount of rub to use, or will it not really matter, as the salt in the rub won't penetrate the meat very much?