Can i rub ribs down and still cook them in th crock pot without ruining the rub?

Well i have never cooked ribs in a crock pot but i am thinking the rub will kind of just sweat off and be in the juices at the bottom of the crock pot but then again i have never done mine in a crock pot . This is what i do i rub my slab of ribs down with brown sugar and all my spices and put them on a rack with a pan to catch the drippings in the oven to cook on a 300 degrees for 3 n 1/2 hrs i mean slow uncovered turning them at least twice you can even go 4hrs its kind of like to your likeness how falling off the bones you want them. mmmmmm mmmmm mmmmm they will love you for that thats some gooood eats