Applying Tech Wax 2.0 or M21 with a rotary buffer? i've beening waxing my passat by hand twice b4......with tech wax 2.0 , i'm a lazy guy and think its quite tired for me :P so my question is can tech wax 2.0 applied with a rotary ? or i've to buy M20/M21 ? I've read serveral posts...