Just to chime in...
As for what speed to use, normally for compounding and polishing you're going to be on the 5-6 speed setting.
Here's the deal and the
BIG PICTURE
The pad
MUST ROTATE in order to do work.
Work is defined as removing swirls, scratches, water spots and oxidation.
Here's the deal, you remove defects by removing a portion of the surface to LEVEL the surface.
Make sense?
So you need the pad rotating. The original 8mm free spinning orbital polisher is the Porter Cable 7424XP. All others that look or work like this tool are copies. This would include the HF polisher.
While they all work the same, because the electronics and quality of electronics plus the quality of the moving parts are all very different the best way to "know" what speed setting to use is to,
A: Understand the pad must rotate to do work.
B: Place a mark on the back of the backing plate to make it easy for your human eyes to "monitor" pad rotation. If the pad is not rotating turn the speed up. If you have turned the speed up all the way and the pad is not rotating then it's something else.
If the above makes sense then click the link below and look at the pictures and watch the short video.
Video: Mark your backing plate to make it easy to see pad rotation
There's also MORE INFORMATION in the above article with links to things like
5" backing plate
5.5" pads
Compression washer
Plus links to even MORE information.
So do some reading. My new favorite saying is this,
Buffing out a car starts with the brain, not the buffer -Mike Phillips
