Bark rubbing off easily...what am I doing wrong?

[heathmd83]

I have just started smoking and have done 3 pork shoulders. The last one was very tender and had really good flavor. All of them though have left black everywhere. Anything that touches it or when I touch it I am covered in black. Is this common? If not what am I doing wrong? I use a rub and then a mop about every hour.

 

[levithan9]

Stop using a mop sauce. 

Apply mustard to the shoulder, then apply your rub.

Wrap in Saran Wrap for 24 hours or longer.

Take out of fridge, let sit for an hour, then throw in the smoker.

This is how i did mine last weekend....

http://www.smokingmeatforums.com/t/253992/2nd-attempt-at-pulled-pork