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Resin-Filled Stone near a Coating Project: Include the Filler in Compatibility Checks

Include resin-filled areas and repairs when testing a stone surface, because the filler may respond differently from the surrounding mineral.

Updated · NANOLAB Knowledge

Editorial illustration: A Practical Quality-Control Process for Ceramic Coating
Editorial illustration

A stone slab can contain mineral surfaces, resin-filled pores, repairs and previous treatments. A coating trial that touches only an unfilled area may miss the material most likely to limit the process.

Identify the complete surface

Ask the stone supplier about filling, resin treatment, polishing and prior sealers. Mark visible repairs and filled veins on a sample photograph. Appearance alone may not reveal every treatment, so record unknown history as a limitation.

Choose a representative test piece

Use an offcut containing the same filler and finish where possible. Include a boundary between mineral and resin. Do not begin an aggressive compatibility test on the client’s finished installation when a representative spare is available.

Separate the observations

Area Check
Stone Colour, gloss and approved cleaning response
Filler Appearance, softening or other change
Boundary Uneven wetting, residue or visible contrast

Approve the system, not the stone name

Follow supplier guidance for preparation, coating and later inspection. A successful result on one filled slab does not establish compatibility with every resin used in that stone variety. If the filler changes or remains unidentified, seek further confirmation before rollout. Record the accepted sample, process and observation times so the installer knows exactly which combination was evaluated.

Ask NANOLAB about your surface and intended use. For application and care, use the current instructions for the exact product.