I once bought a Black Magic Tire dressing that i came in a handy (so i thought) grooved for the tire foam applicator. When you apply the applicator to the tire you would just squeeze the bottle and theoretically the gel would go on evenly. YEAH RIGHT. When i tried it the first time, the foam peeled off leaving the tire gel to get everywhere (hands, tires, floor). That thing is still hanging in my garage as a reminder to never buy that crap again.