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Coating Thickness on Plastic: Why a Metal-Substrate Gauge May Not Help
A gauge designed around a metal substrate cannot automatically measure a coating on plastic. The measurement principle must suit the entire material system.
Updated · NANOLAB Knowledge
Practical approach
Identify the substrate, coating layers and expected thickness range. Ask a qualified laboratory or instrument supplier which method can resolve the question.
A bumper reading absent from an ordinary paint gauge does not mean the bumper has no paint or protection.
Decision limits
Do not substitute an arbitrary thickness from adjacent metal panels. Treat unmeasured plastic areas as unknown and choose work methods accordingly.
Related guidance
- Paint Thickness Readings on Steel and Aluminium: Record the Substrate
- Measuring Paint Thickness Before Polishing and Coating
- Paint Thickness Readings Near an Edge: Check the Gauge's Limits
- Paint Gauge Reference Shims: Keep Damage Out of the Verification Process
Method reference: DeFelsko: coating thickness measurement. References describe their stated methods or products; they do not certify NANOLAB products or establish compatibility with an unlisted surface.
Ask NANOLAB about the exact product and intended use. Use the current product documentation for formulation-specific instructions.
Continue reading
Paint Thickness Readings on Steel and Aluminium: Record the Substrate
A thickness record should identify the measured substrate and gauge method. A mixed-material vehicle can produce readings that are not directly comparable.
Measuring Paint Thickness Before Polishing and Coating
Understand what a paint gauge can measure, where its limits matter and why readings should support rather than replace surface assessment.
Paint Thickness Readings Near an Edge: Check the Gauge’s Limits
Measurements near a panel edge may be affected by geometry. An unusual reading needs method verification before it becomes a polishing decision.