Not my prefered method but I got caught with my shorts down once and ran out of Imperial and used Crisco.
Just rub your palms and fingers with it and then roll the casings back and forth in your hands, worked in the pinch. Pay special attention to the casing sides. Thats where it's needed most anyway. Don't goop too much on the shoulders and necks as that causes crumpled shoulders.
humm. Just re-read this and it almost sounds lewd and lascivious.
Best wishes, Bill