Level Finish · Technical Test Report

Omega P1500 vs 3M Purple 260L: the cut and the finish, measured

Level Finish Omega P1500 refining disc vs 3M™ Purple Finishing Film 260L P1500. One controlled comparison on clear coat, run under a locked, normalized sanding exposure that was equal for both products. Under that equal exposure, 3M removed more material. Omega left the finer measured surface, with the tighter spread of readings. Both results are published here, because at P1500 the two questions always travel together: how much clear comes off, and what surface is left for the next step.

The Omega P1500 post graphic, as published on our Facebook and Instagram. Mean post-sanding Ra: Omega 0.1430 µm vs 3M 0.1595 µm.

What happened, in short

• Material removal: 3M recorded the higher removal. Mean removal was 0.329 mil for 3M Purple 260L vs 0.233 mil for Omega, so under the equal exposure used here, 3M removed approximately 41% more clear coat by mean removal.
• Surface finish: Omega recorded the finer finish. Mean post-sanding Ra was 0.1430 µm for Omega vs 0.1595 µm for 3M, approximately 10.3% lower.
• Consistency: Omega's Ra readings grouped tighter: coefficient of variation 7.69% vs 9.58%, standard deviation 0.0110 µm vs 0.0153 µm.
• The honest summary: 3M took the removal category and Omega took the finish categories. This page does not pretend either product won everything.

Method

Both products were run under a locked normalized sanding exposure of 0.2557 sec/in², identical for 3M and Omega, so exposure cannot explain the differences. Material removal was measured across each test area: positive removal was recorded at 85 of 88 measured locations for 3M and 86 of 99 for Omega. Post-sanding surface roughness was recorded as Ra (arithmetic average surface roughness, in µm; lower is finer), summarized from 10 readings per product.

Results: surface finish

Post-sanding Ra	3M Purple 260L P1500	Level Finish Omega P1500
Mean Ra	0.1595 µm	0.1430 µm
Median Ra	0.1595 µm	0.1400 µm
Ra standard deviation	0.0153 µm	0.0110 µm
Ra coefficient of variation	9.58%	7.69%
Ra range (max minus min)	0.049 µm	0.032 µm

Omega's mean Ra was approximately 10.3% lower, and its readings were the more consistent set by standard deviation, coefficient of variation, and range.

Mean post-sanding Ra (µm). Lower is finer.

Results: material removal

Material removal	3M Purple 260L P1500	Level Finish Omega P1500
Mean removal	0.329 mil	0.233 mil
Median removal	0.295 mil	0.220 mil
Removal standard deviation	0.217 mil	0.295 mil
Locations with positive removal	85 of 88 (96.6%)	86 of 99 (86.9%)

The difference in mean removal was 0.096 mil. On removal, the advantage in this test belongs to 3M, and it is stated here as plainly as the finish advantage is stated above.

How to read this test

This is a cut versus finish tradeoff, and the verified interpretation of the test says so directly: 3M Purple 260L demonstrated the higher material-removal rate under equal normalized exposure, and Omega produced the finer measured final surface. More material removal does not automatically mean the better result for every refinishing step. The desired level of clear-coat removal and the desired resulting finish must both be considered. P1500 sits late in the process, where the surface left behind is what P2000 and the polishing steps inherit. Which side of this tradeoff matters more depends on how much defect has to come out and how the shop runs the steps that follow. That call belongs to the technician. Our job is to publish the measurements exactly as recorded and let you decide for yourself.

More test results

Omega P2000 vs 3M Purple P2000, filmed side by side on one panel: see the filmed test results. Alpha P80 vs 3M Cubitron II, two controlled tests: see the P80 test results. More reports are filed here as testing is completed.

Notes and limitations

Each comparison is a single controlled trial under its documented conditions, and the results describe that trial. Sanding exposure was normalized and equal for both products. Ra is the measured arithmetic average surface roughness under the documented test conditions; it is not a measurement of individual scratch width or depth. Results from one grit or substrate do not transfer to another.

Frequently asked questions

Which P1500 disc removed more material?

3M Purple 260L. Its mean removal was 0.329 mil vs 0.233 mil for Omega under the same normalized exposure, approximately 41% more clear coat by mean removal.

Which P1500 disc left the finer surface?

Omega. Its mean post-sanding Ra was 0.1430 µm vs 0.1595 µm for 3M, approximately 10.3% lower, with the tighter distribution of readings (CV 7.69% vs 9.58%).

So which disc won?

Neither product won every category. 3M recorded the higher removal; Omega recorded the finer, more consistent finish. We publish both metrics so technicians can decide which matters more for their process.

Level Finish · St. George, Utah · level-finish.com · Source: Level Finish verified comparative test record, Omega P1500 vs 3M Purple Finishing Film 260L. Page prepared November 13, 2026. All numbers transcribed exactly from that record; no values added or altered.