Some "wet" rubs may have oil, water, or other liquid added to make a thick paste.
The most straightforward rub is just coarsely ground black pepper as in steak au poivre.
[1] Spice rubs can also add ingredients such as herbs, crushed garlic, or oil to make a paste.
The most popular cooking method for food prepared using a spice rub is grilling.
Sautéing is another method, especially if the spice rub includes flour or bread crumbs.