1200 vs 1500 Grit Sandpaper: Choose by the Next Step

Both grades are polishing-range abrasives, but 1200 leaves a little more cutting authority while 1500 reduces the depth of the remaining scratch pattern. The short answer: Use 1200 when visible 1000-grit marks or minor texture still need correction; use 1500 when the surface is already uniform and the next operation is a finer abrasive or compound.

What the two grades actually change

The practical dividing line is whether correction is still happening. If a 1000-grit line survives, 1500 may polish around it while leaving the line intact. If the panel is already flat and evenly hazed, returning to 1200 only spends more film build. Judge the deepest repeatable mark, not the average gloss.

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

Divide a test area, work each side for the same number of light passes, dry it fully, and compare under a point light before committing to the whole panel.

Use a freshly cleaned surface and move one point light across it. Broad diffuse light is good for judging overall sheen; a low point light is better at exposing a deep survivor. Make the final call only after dust, slurry, and temporary gloss have been removed.

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, 1500-grit 25-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 clear sample, one half still carries isolated 1000-grit lines. The 1200 side removes them predictably; the 1500 side improves gloss but leaves several lines intact.

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.

Advance only when the entire area shows one even scratch family with no isolated deeper marks.

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.

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.