I have used these pads many many times. I prefer using a rotary for "tired" paint. Heres the secret: when using a rotary, In my experience the machine should be tilted a little. With the product in the middle of the pad, it can be laid flat to release product onto surface at slow rpm, then tilted and brought up to speed (1000-1500 rpm) using the edge of the pad to create heat to dissipate product, remove defects and bring to a shine. Depending on the pressure, the amount of pad contacting the surface can be varied, also be degree of angle machine is tilted. With the pocket inthe middle, as machine is tilted, the product stays in middle until needed. Using a rotary takes patience and skill. Its much easier to cause damage to a finish with a rotary compared to a D.A. machine. I just finished a '73 Mustang conv. for a relative. It was painted in a single stage paint and probably wasnt maintained since early '80's. I used the rotary to heat up the paint and bring back the "luster" because of speed and workability of rotary, the polished with a PC7424 for ease. Granted that every pad has its pros and cons and some pads are a challenge to get used to. I dont know if this will help anyone, just giving input. Thanks