Published by Renew and Seal
What a penetrating stone sealer generally does
Impregnating products may make it harder for certain spills to enter porous stone quickly, giving more opportunity to remove the spill. Their performance depends on the actual stone, product, preparation and application. They cannot make every material stain-proof.
What is staining?
A stain involves colour or contaminants affecting the stone's appearance. Some stains sit near the surface while others penetrate pores. Identifying the substance and the stone is important when considering a cleaning or removal product.
What is etching?
Etching commonly occurs when acids react with calcium-based stone such as marble or travertine. The reaction changes the finish itself, often leaving a dull or cloudy patch visible under angled light. Treating an etch as ordinary dirt can lead to unnecessary chemical use.
Will sealing stop etching?
Impregnating sealers generally are not an acid barrier. A stone may be well sealed against a particular stain yet still etch after acidic contact. A topical coating is a different product type with its own limitations and suitability questions.
When do polishing or honing come in?
If the stone's surface has been physically altered, suitable abrasive refinement might be required to improve the finish. The stone, defect depth and desired appearance determine what is reasonable. More aggressive treatment is not automatically better.
What details should you record?
Photograph the mark in angled light, identify the material if possible, record the suspected spill and note previous sealers or cleaning products. Avoid acid testing or unverified abrasive methods on the affected area.
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Reference: Natural Stone Institute — cleaning, sealing and etch marks.