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Mixed Metal Finishes in One Coating Project: Use Separate Acceptance Samples
A project may combine brushed stainless, polished metal and decorative factory finishes. A single accepted sample should not silently approve the process for every exposed surface.
Updated · NANOLAB Knowledge
Create a finish schedule
List the actual outer surfaces and the product information available for each. Appearance alone may not establish whether a panel is bare metal or factory-coated. Record uncertain identities before selecting the preparation method.
Match samples to surfaces
Use a representative sample or agreed test area for each materially different finish. Keep preparation, coating and inspection records separate. This avoids assigning the successful result on one surface to another with a different outer layer.
Define acceptance clearly
Describe the visible finish and the practical requirement for each sample. Keep appearance approval separate from claims about long-term durability, cleaning performance or exposure that the trial has not measured.
Carry the distinctions into maintenance
Issue care instructions that identify which method belongs to each surface. Avoid a universal cleaner list if the supplied guidance differs. Keep the finish schedule available to future cleaning and repair teams.
Frequently asked question
Can two panels that look identical share one approval?
Only when their relevant surface identity and process are established as equivalent. If the outer finish is uncertain, confirm it before extending an approval.