500 vs 600 Grit Sandpaper: A Practical Test

At this range, substrate hardness, abrasive standard, backing, lubrication, and the next finish step can matter more than the small number gap. The short answer: Choose 500 when a stable surface still needs measurable refinement; choose 600 when correction is complete and you are reducing the scratch before coating, polishing, or the next finer grade.

What the two grades actually change

At this range, a difference in backing, mineral, lubrication, or loading can outweigh the number printed on the sheet. Compare like with like. A fresh P500 wet sheet and a worn 600 dry sheet are not a controlled grit comparison, and their apparent speed says little about the nominal grades.

The table is a starting decision, not a universal sequence. Grade labels also depend on the grading system, and two products with the same nominal number can cut differently as backing, mineral, coating density, lubrication, and wear change.

Compare them without sacrificing the whole surface

Keep the abrasive system constant, change only the grade, and compare equal test patches after cleaning and drying. Do not compare a fresh wet 600 patch with a dry, loaded 500 patch.

Write down abrasive label, backing, wet or dry condition, support, approximate passes, and what you observed. That five-line record makes a later correction reproducible and prevents a worn sheet from being compared with a fresh one.

Use the same support, pressure, pass length, cleaning method, and inspection condition on both halves. Replace a loaded sheet instead of pressing harder. When the surface is wet, squeegee or rinse it and let it return to a dry appearance before comparing the scratch.

For a sheet-format option, 600-grit 10-sheet pack can be cut to a suitable hand block or detail support. The product link confirms the offered format and grade; it does not establish compatibility with an unknown coating, resin, stone, or finishing system.

Read the result

On a cured epoxy offcut, 500 clears the last isolated 400-grit lines sooner. Once they are gone, 600 produces a more even haze without spending extra time chasing defects it cannot efficiently remove.

The winning grade is the one that reaches the defined endpoint with the least unnecessary removal. If the finer side looks shinier but retains isolated deep lines, it has not completed the correction. If the coarser side removes no additional defect, its extra cut has no purpose.

Move forward when both direct and oblique light reveal no survivor scratches from the earlier step.

Change one variable per trial. If grade, pressure, support, lubricant, and tool speed all change together, a better result cannot tell you which correction worked.

Keep the result as a process note for this material and finish. Do not turn one successful sample into a universal ladder: a different backing, coating, machine, or next finish can move the sensible starting point.