This will create a paste that the rub will stick to. Here is a recipe for the rub I use on pork shoulders. After you apply a layer of mustard to the pork shoulder, completely coat the shoulder with a good BBQ rub.
yes, its a thing, a noun is a person place or thing. Shelter is a usually used as a noun: We built a shelter to sleep in during the snowstorm. It is also sometimes a verb: We were told to shelter in place during the fire. The trees sheltered us from the hail.
the lair or shelter of a wild animal, especially a predatory mammal. 2. a room, often secluded, in a house or apartment, designed to provide a quiet, comfortable, and informal atmosphere for conversation, reading, writing, etc. 3. a cave used as a place of shelter or concealment. 4. a squalid or vile abode or place: dens of misery.