IMO:
With everything else being equal---tool,
product, downforce, tool speed, etc...
4" pads will be more efficient in transferring the
tool's energy (torque) to the vehicle's paint than
5" or 5.5" pads; along with: the ability for improved
paint correcting (defects removal) capabilities.
Bob
Bob's point is correct, but does not account for the dramatic increase in the size of the area being polished with a 5.5" pad vs. 4".
Torque and energy transfer is not an issue, as the OP owns a FLEX 3401.
IMO you should take advantage of the direct drive and use the largest pad that will fit on the section being polished.
I started with CCS 5.5" and have recently been using a lot of 6.5" LC Hybrids with great results and improved efficiency.
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