Professional Detailing2 min read

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.

Updated · NANOLAB Knowledge

A chart can imply a steady rate of change even when observations were taken at irregular intervals. Plotting actual elapsed time preserves the spacing between visits and makes gaps in a coating study visible.

Keep dates in the data

Suppose an illustrative trial has observations on days 0, 7, 30 and 120. Placing those visits at equal distances on a chart makes the last 90-day interval look the same as the first seven days. A date or elapsed-day axis represents the exposure more honestly.

Retain both the calendar date and time since application. If several samples began on different dates, elapsed time supports comparison while calendar dates help identify common weather or maintenance events.

Show gaps and intervention points

Do not manufacture intermediate observations by joining a sparse series with a smooth curve that appears measured. A connecting line can guide the eye, but identify it as such and leave missing points visibly missing.

Mark events such as polishing, repair, a topper application or a changed cleaning procedure. A sudden change after one of these events cannot automatically be attributed to the original coating's natural ageing.

Choose scales that preserve context

Use clear units and consistent axes when comparing samples. A tightly cropped vertical axis can make a tiny change look dramatic; a very wide one can hide a relevant change. State the range and show the original values where practical.

For a report, include sample count at each time point, because later averages may be based on fewer vehicles. A line that continues smoothly while the observed group shrinks can conceal substantial uncertainty. A useful chart communicates what was measured, when it was measured and which events may affect interpretation, rather than simply presenting an attractive trend.

Related guidance

For product-specific application instructions, consult NANOLAB technical documentation or ask about your surface and intended use.