Polishing & Paint Correction2 min read

Unequal Starting Defects in a Compound Comparison: Fix the Baseline

A compound comparison can reward the easier test area rather than the better process. Inspect and document the starting finish before assigning products to areas.

Updated · NANOLAB Knowledge

Record the baseline

Prepare the surface appropriately and inspect the candidate areas dry under the same light. Note defect type, distribution and repair history. Adjacent areas are convenient, but adjacency does not guarantee equivalent starting conditions.

Choose a defensible layout

Use representative areas and keep their identities clear in the record. Where differences remain, describe them and limit the conclusion. Do not remove an inconvenient area from the result only after its assigned compound performs less well.

Apply the agreed method

Follow the product instructions and keep operator, setup and inspection differences visible. Use suitable residue removal for each system. A trial should not become a sequence of undocumented adjustments designed to make one area win.

Compare change as well as appearance

Judge the final finish against each area’s own baseline and the agreed acceptance. Include retained marks and total work. If the baseline uncertainty is too large, redesign the test rather than presenting a confident product ranking.

Frequently asked question

Are two halves of the same bonnet always a fair comparison?

No. They may differ in defects, exposure or repairs. Inspect the starting areas and report limitations before interpreting the result.