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Coating Trial Stopping Rules: Decide Before Results Arrive
Ending a test when results look favourable can bias the conclusion. A stopping rule should be defined before the comparison begins.
Updated · NANOLAB Knowledge
Practical approach
State planned duration, inspection points and legitimate early-stop conditions. Record departures from the plan with their reasons.
Stopping one candidate after a good week while continuing another through harsher exposure creates an unfair comparison.
Decision limits
Do not conceal early termination. Explain what was observed and what the shortened test cannot establish.
Related guidance
- Plot Coating Trial Results Against Actual Time, Not Equally Spaced Visits
- Salt-Spray Results for Nano Coatings on Metal
- Coating Trial Data: Keep Raw Observations Separate from Scores
- Coating Retests: Investigate the First Failure Before Repeating
Ask NANOLAB about the exact product and intended use. Use the current product documentation for formulation-specific instructions.
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Plot Coating Trial Results Against Actual Time, Not Equally Spaced Visits
Plot coating observations against actual elapsed time, preserve missing visits, and mark interventions that affect interpretation.
Salt-Spray Results for Nano Coatings on Metal
Interpret salt-spray reports for nano-coated metals by checking the complete specimen system, acceptance criteria and limits of outdoor-life predictions.
Coating Trial Data: Keep Raw Observations Separate from Scores
A score compresses observations into a category. Retaining the underlying observations allows later review when the scoring rule is questioned.