Symptoms Outside of the ring reaches gloss, but the inside remains dull.The same compound seems to work outside but not inside.
Likely causes Small tool diameter and lower surface speed may keep the working zone below the heat needed for a standard polishing paste to become fully mobile.
Checks Compare the outside wheel diameter with the inside tool diameter.Check rpm and whether the inside tool feels dry or underactive.
Recommended fixes Treat the inside as a small-tool / low-temperature polishing problem.Inspect tool diameter and rpm.Consider LUXI Green or LUXI Purple depending on required aggressiveness and geometry.
Prevention Record inside-tool diameter and rpm during process development.Do not assume the inside route behaves like the outside 6 inch wheel route.
Recommended workflows Checking wheel diameter and speed before polishingPolishing rose-gold electroplated coatingTitanium low-temperature polishingPorous castings from 3D prototypes — surface polishing with LUXILow-temperature controlled polishing with LUXI GreenLUXI Purple for brushes, cord, thread, relief and recesses
Understand the cause Wheel diameter, rpm and linear speed in the contact zoneBrush, Thread and Small Tool LogicWhy planar items require a more active first polishing stage