i tried to claybar my car once this summer... maybe im a retard and dont know how to do it, but i thought it was really hard... like u have to spray a little area and then rub for like 10 secs then another little area etc. and it could take like 5 hrs to claybar the car, but i did it on a really hot day so im thinking it might have messed with the waxing spray and dried it out