I will be doing my first pork butts this weekend. They are boneless do you rub the slab with the rub before you tie it. So you have the spices in the center of the butt?
Done many a Mr Brown (always bone in) and have never tied them and yes..I rubbed them over all exposed surfaces, and any crevice I find.
They are going to be tasty!
When I do boneless, I usually tie them first. No real reason but it always works well for me. I did read once on here that someone had put rub inside before they tied it and it got a little nasty.