{"id":3546,"date":"2026-10-30T11:10:34","date_gmt":"2026-10-30T11:10:34","guid":{"rendered":"https:\/\/sagit-global.com\/?p=3546"},"modified":"2026-11-03T14:01:55","modified_gmt":"2026-11-03T13:01:55","slug":"renover-poncer-marbre","status":"publish","type":"post","link":"https:\/\/sagit-global.com\/en\/entretien-et-maintenance\/renover-poncer-marbre\/","title":{"rendered":"Renovating marble: sanding, polishing and knowing when to stop"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Renovating marble means reworking its surface with abrasives of increasing grit, from coarse to fine, then bringing back the shine. It removes material: it is irreversible and limited by the thickness of the slab. Before sanding, you therefore need to identify how deep the damage goes and what the original finish was.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><strong>Key points<\/strong><\/p>\n<p>\u2013 The <strong>dulling<\/strong> is not a stain: the ICOMOS-ISCS glossary classes it among losses of material. It cannot be cleaned; it is repolished.<\/p>\n<p>\u2013 Calcite is at degree <strong>3 on the Mohs scale<\/strong> and \u201cis easily scratched with a knife blade\u201d (University of Waterloo). That is what makes sanding possible, and risky.<\/p>\n<p>\u2013 Grit progression cited by Google's AI Overview: <strong>30 to 50<\/strong>, then <strong>120 to 220<\/strong>, then <strong>400<\/strong>, then <strong>800<\/strong>, then <strong>1000 and above<\/strong>. No standard publishes it,<\/p>\n<p>\u2013 Repolishing a floor makes it <strong>more slippery when wet<\/strong> : under NF EN 14231, a polished finish measures 10\u201315 SRV, honed under 35, bush-hammered above 45.<\/p>\n<p>\u2013 The chemistry of the <strong>crystallisation<\/strong> is published by no accessible source. The only page that describes the process speaks of an \u201cacid powder\u201d.<\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">This article deals with the work itself, not the service. It continues our <a href=\"https:\/\/sagit-global.com\/en\/all-about-marble\/entretien-et-maintenance-du-marbre-un-guide-complet\/\">complete guide to marble care and maintenance<\/a>, picking up where cleaning can do no more.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Where cleaning stops and renovation begins<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The boundary comes down to a single criterion: has the material gone, or is it still there under a deposit? <strong>Dulling<\/strong> is the increase in roughness of an originally polished surface, placed by the ICOMOS-ISCS glossary in the family of features induced by loss of material, not among stains. The glossary adds that this loss of polish produces an increase in lightness, and that dark marbles show it visibly.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The direct consequence: a matt area on a polished marble cannot be cleaned. No product puts calcite back. It is repolished, or it stays. That is exactly the case covered in our article on <a href=\"https:\/\/sagit-global.com\/en\/entretien-et-maintenance\/tache-blanche-marbre-noir\/\">white marks on black marble<\/a>, where the white mark is a rough surface that diffuses light instead of reflecting it.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Observed condition<\/th><th>What is at stake<\/th><th>Intervention<\/th><\/tr><\/thead><tbody>\n<tr><td>Haze, greasy film, product residue<\/td><td>Foreign matter sitting on the stone<\/td><td><a href=\"https:\/\/sagit-global.com\/en\/all-about-marble\/comment-nettoyer-le-marbre-sans-abimer-ni-ternir-la-surface\/\">Cleaning<\/a>, suitable stripper<\/td><\/tr>\n<tr><td>Colouring that has migrated into the pore network<\/td><td>A substance to extract, not to abrade<\/td><td><a href=\"https:\/\/sagit-global.com\/en\/all-about-marble\/comment-enlever-les-taches-sur-le-marbre-les-methodes-professionnelles-en-toute-simplicite\/\">Poultice<\/a><\/td><\/tr>\n<tr><td>General loss of shine, no relief<\/td><td>Worn polish<\/td><td>Polishing, without prior grinding<\/td><\/tr>\n<tr><td>Recessed matt area, scratch, chip<\/td><td>Loss of material<\/td><td>Grinding then polishing, irreversible<\/td><\/tr>\n<tr><td>Crack, lipping, scaling<\/td><td>Structural damage<\/td><td>Professional diagnosis<\/td><\/tr>\n<\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">The good news is documented by a producer: natural stone \u201ccan always be restored by repolishing the surface, which restores the original finish\u201d (Levantina, data sheet, March 2025). The bad news lies in the word \u201calways\u201d, which applies to stone in general, not to your slab at its current thickness.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Sanding marble: the method and the grit sequence<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Grinding<\/strong> is the abrasion stage before polishing: a series of increasingly fine abrasives is used, each removing the marks left by the previous one, until the surface is even enough to take a shine. The term belongs to the trade vocabulary and does not appear in the ICOMOS glossary.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Why it works on marble: calcite, which makes up most of it, is at grade 3 on the Mohs scale and \u201cis easily scratched with a knife blade or a geologist\u2019s hammer\u201d (<a href=\"https:\/\/uwaterloo.ca\/earth-sciences-museum\/resources\/detailed-rocks-and-minerals-articles\/calcite-limestone-and-marble\">University of Waterloo, Earth Sciences Museum<\/a>). This softness is why marble can be reworked by hand, and also why too coarse a grit digs in quickly. Note that the figure comes from the mineralogy of calcite and not from a standardised test on the stone: NF EN 14205 on Knoop hardness was withdrawn in September 2013 (CTMNC, July 2021).<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">The grit progression<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Grit 30 to 50<\/strong> : tackling a heavily scratched or uneven surface. This is the stage that removes the most material.<\/li>\n<li><strong>Grit 120 to 220<\/strong> : removing the marks of the previous stage.<\/li>\n<li><strong>Grit 400<\/strong>, then <strong>800<\/strong>, then <strong>1000 and above<\/strong> : preparing the surface for the shine.<\/li>\n<li>Work wet or on a dampened surface, to avoid overheating and scratches.<\/li>\n<li>Vacuum or rinse <strong>between each change of grit<\/strong> : coarse abrasive left on the slab produces micro-scratches at the next stage.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Caution.<\/strong> This sequence is the one cited by Google\u2019s AI Overview for the query \u201cponcer du marbre\u201d (sanding marble), as recorded on 25 September 2026. Its nine sources are tool retailers, three videos and a directory. It is therefore an aggregate of commercial pages, not a standard, and no tier 1 or 2 source consulted publishes a quantified progression. To be checked against the technical documentation of the abrasive used.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">No rotation speed, contact pressure or time per stage is given here: these values are documented in no source consulted, and they depend on the machine.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What sanding removes from the slab<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Sanding does not erase a defect: it lowers the surface below the defect. The thickness lost does not come back, and that is the information neither renovation articles nor tool tutorials give. The available margin therefore depends on the thickness of the product laid, not on the state of its surface.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">On a thin product, the margin is small. A <a href=\"https:\/\/norminfo.afnor.org\/norme\/nf-en-12057\/produits-en-pierre-naturelle-plaquettes-modulaires-exigences\/82135\">modular tile under NF EN 12057<\/a> structurally leaves less material to sacrifice than a thick slab. It is a selection criterion at purchase as much as a care criterion: our <a href=\"https:\/\/sagit-global.com\/en\/dalles-de-marbre\/\">marble tiles<\/a> come in several thicknesses, and that thickness determines how many times they can be reworked over the life of the floor or the <a href=\"https:\/\/sagit-global.com\/en\/plans-de-travail-en-marbre\/\">work plan<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Caveat: the number of possible reworkings per thickness.<\/strong> No standard, data sheet or professional document consulted publishes the thickness removed per pass or the maximum number of repolishings. This figure does not exist in the accessible sources, and inventing it would be a lie that helps nobody.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">There is, however, a marker for the limit of surface abrasion against deep colouring. On a marble stained by iron, iron remains the dominant element down to about 800 \u00b5m and calcium only becomes predominant again at about 1.7 mm depth (Reale et al., <em>Molecules<\/em>, 2023). In other words, colouring of this kind lies below the zone a finishing sand reaches: it has to be extracted, not abraded.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What cannot be sanded<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A finish is not a state of wear: it is a product. A honed, brushed, sandblasted, bush-hammered or tumbled marble was made that way. Reworking it with a fine grit does not \u201crestore\u201d it; it turns it into a polished finish, and therefore into a different product. The result is not a renovation but an irreversible change of appearance on the piece concerned.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Two other cases call for diagnosis before any work: a crack running through the slab, and a slab whose joints already stand proud through wear. In both situations, abrasion moves the problem without treating it.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Repolishing a floor makes it more slippery<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">This is the safety warning that the pages ranking for these queries do not give. Slip resistance is measured with the pendulum friction tester under NF EN 14231, and it changes with the finish. On the data sheets of a black limestone producer, the wet polished state is declared at 10 SRV and under 15 SRV, honed under 35 SRV, bush-hammered above 45 SRV, the same stone reaching 70 SRV when dry.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Bringing a bathroom, shower or entrance floor back to a high shine therefore lowers its grip when wet. These values come from producer data sheets for a given batch; they are not a universal property of marble: ask for the declaration of performance for your batch and your finish. If the floor is regularly wet, the question to ask before sanding is not \u201chow do I make it shine\u201d but \u201cwhich finish do I want to live with\u201d.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Crystallisation, and the contradiction Google produces<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Crystallisation<\/strong> is a shine-restoring process applied wet to a marble that has already been ground, using a specific product and a buffing machine. This definition describes a method, not a reaction: it stops exactly where the accessible sources stop.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A survey of the search results reveals a contradiction produced by Google itself. On one query, its generated summary explains that an acidic product attacks the limestone of marble and leaves a matt haze. On the neighbouring query, the same system concludes that you should \u201cfinish with crystallisation\u201d to protect the stone against stains. And the only page in the corpus that describes the process calls it \u201cacid powder for wet polishing\u201d. Nobody reconciles the two.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Caution, without exception.<\/strong> None of the nine source pages of Google\u2019s summary names the product\u2019s composition. None gives its pH or the mechanism by which an acid process would make calcium carbonate shine. This information is not published in the accessible sources, and saying so is better than an invented explanation. The only document that would contain it is the safety data sheet of the crystallising product used, to be requested from whoever applies it.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Two useful clarifications in the meantime. Crystallisation is not a protective treatment: a <a href=\"https:\/\/sagit-global.com\/en\/all-about-marble\/hydrofuge-marbre-protection-impermeabilisation\/\">water-repellent or impregnating sealer<\/a> follows a different logic and is a different product. And \u201ccrystallisation\u201d has nothing to do with \u201cwashing soda crystals\u201d, an alkaline household product whose French name causes frequent confusion.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Three widespread tips best avoided<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">These three claims appear in the top ten French results on marble renovation. None holds up.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u201cMaking marble less porous, that is to say more permeable\u201d.<\/strong> The two halves of the sentence contradict each other. A less porous stone lets less water through, so it is less permeable, not more.<\/li>\n<li><strong>Buffing with petroleum jelly.<\/strong> A greasy substance deposited on the surface is not a polish. The ICOMOS glossary calls it a <em>film<\/em> : a thin, usually organic covering that follows the surface without penetrating it, changes its appearance and \u201cmay, as it ages, lose its transparency\u201d.<\/li>\n<li><strong>Buffing with olive oil.<\/strong> Same mechanism, and it is exactly the description of the whitish haze seen a few months later. The shine obtained is that of the film, not of the stone.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Caution.<\/strong> No standardised test consulted concerns petroleum jelly or olive oil applied to marble. The reasoning above relies on the ICOMOS definition of a film, not on a measurement. It stands as a probable mechanism, not as proof.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What you can do yourself and what you cannot<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The dividing line is simple: as long as no material is removed, the attempt is reversible. As soon as you abrade, it is not. Reasonably within a homeowner\u2019s reach are cleaning with a neutral detergent, removing a film, and restoring the shine of a small area with a hand polishing product. A floor, a large visible continuous surface, any finish other than polished, a thin slab, and anything requiring a machine are for a professional.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Sanding dust: a point not to be glossed over<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Sanding stone produces dust, and that subject should not disappear from a tutorial. <strong>Caveat: no tier 1 or 2 source consulted for this article deals with the respiratory risk of sanding marble or the protective equipment to wear.<\/strong> The information is not published in the accessible documents, and it is not our place to establish it. Two points can nevertheless be checked. All the methods found work wet or on a dampened surface. And the safety data sheet of the abrasive and the product used is the only authoritative document on this point. In an occupied home, calling in a professional equipped with on-tool extraction is the prudent answer.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">When to call a professional<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Four signs are enough: the surface is a floor, the finish is not polished, the available thickness is small, or the damage is structural. In these cases, trying it yourself costs more than calling someone in. Sagit supplies the stone and has it shaped to the dimensions required, without providing on-site renovation services: for a question about thickness, finish or compatibility before work, <a href=\"https:\/\/sagit-global.com\/en\/contactez-nous\/\">write to us<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Frequently asked questions<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Can marble be sanded?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Yes, because calcite is soft, at Mohs 3. But not all marble can be sanded: it depends on the original finish, the available thickness and the depth of the damage. A polished marble can be reworked; a honed or brushed marble is ruined.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Which sandpaper should be used for marble?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The rule is not a single grit but a progression: from the coarsest needed to the finest useful, without skipping a stage. The progression cited by Google\u2019s AI Overview runs from 30\u201350 to 1000 and above, via 120\u2013220, then 400 and 800. It is not standardised: refer to the abrasive\u2019s documentation.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Can marble be sanded by hand?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">On a small area and with a fine grit, yes. On a large surface, no: a hand cannot hold a flat plane, and uneven reworking shows more than the original defect in raking light. The risk is not breakage; it is hollowing.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">How do you restore dulled marble?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">First, by identifying the cause. Uniform dulling with no relief calls for polishing, without prior grinding. A matt area with the sharp outline of a spilt liquid is dulling, a loss of material that can only be treated by repolishing. A regular, slightly greasy haze is more likely a film to <a href=\"https:\/\/sagit-global.com\/en\/all-about-marble\/comment-nettoyer-le-marbre-sans-abimer-ni-ternir-la-surface\/\">removed by cleaning<\/a>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">How do you strip marble?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Stripping, strictly speaking, means removing an added layer: wax, film, treatment residue. It is done with a stripper suited to the film in place, not with an abrasive. If the surface remains matt after stripping, the problem was not the layer but the stone itself.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Which products should not be used on marble?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Anything acidic, since calcite dissolves: vinegar, lemon, descaler, rust stain remover not approved for calcareous stone. Also avoid scouring powders, which are abrasive on a stone at Mohs 3, and greasy substances presented as polishes. One producer recommends sticking to detergents with pH 7 to 10.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Key points<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A successful marble renovation starts with a decision, not a machine. The useful question is not \u201cwhich grit\u201d but \u201chave I lost material, and how much more can I lose\u201d. A polished marble can be restored, provided there is thickness left below the surface and the finish you are aiming for is indeed the original one. If the doubt concerns the thickness or finish of your stone, it is a supply question before it is a care question: our <a href=\"https:\/\/sagit-global.com\/en\/dalles-de-marbre\/\">marble tiles<\/a> are described thickness by thickness.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Sources<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>University of Waterloo, Earth Sciences Museum, <em>Calcite, limestone and marble<\/em>. <a href=\"https:\/\/uwaterloo.ca\/earth-sciences-museum\/resources\/detailed-rocks-and-minerals-articles\/calcite-limestone-and-marble\">Online data sheet<\/a> (consulted on 25\/09\/2026).<\/li>\n<li>Verg\u00e8s-Belmin V. (ed.), <em>ICOMOS-ISCS: Illustrated glossary on stone deterioration patterns<\/em>, Monuments and Sites XV, 2008, ISBN 978-2-918086-00-0. <a href=\"https:\/\/iscs.icomos.org\/wp-content\/uploads\/2022\/06\/Monuments_and_Sites_15_ISCS_Glossary_Stone.pdf\">Open-access glossary<\/a> (consulted on 25\/09\/2026). Definitions of increase in roughness and dulling (p. 30), discolouration (p. 46) and film (p. 52).<\/li>\n<li>NF EN 12057, <em>Natural stone products, modular tiles, requirements<\/em>, April 2015. <a href=\"https:\/\/norminfo.afnor.org\/norme\/nf-en-12057\/produits-en-pierre-naturelle-plaquettes-modulaires-exigences\/82135\">AFNOR listing<\/a> (consulted on 25\/09\/2026).<\/li>\n<li>NF EN 14231, <em>Natural stone test methods, Determination of slip resistance by means of the pendulum tester<\/em>, December 2003. Exact title according to CTMNC, <em>Principales exigences techniques applicables aux produits de construction en pierre naturelle<\/em>, July 2021, p. 15. All rights reserved to CTMNC, www.ctmnc.fr.<\/li>\n<li>Levantina, <em>Negro Marquina, ficha t\u00e9cnica<\/em>, March 2025: SRV values by finish under NF EN 14231, care instructions pH 7\u201310, and restoration by repolishing. Additional value of 10 SRV wet polished: TINO Stone &amp; Surfaces, <em>Marquina, ficha t\u00e9cnica<\/em>, November 2024. 70 SRV value when dry: Canteras Olaspe.<\/li>\n<li>Reale R., Andreozzi G.B., Sammartino M.P., Salvi A.M., <em>Analytical Investigation of Iron-Based Stains on Carbonate Stones<\/em>, <strong>Molecules<\/strong>, 28(4):1582, 2023: iron diffusion depths (\u2248 800 \u00b5m, \u2248 1.7 mm).<\/li>\n<li>Withdrawal of NF EN 14205 on Knoop hardness in September 2013: CTMNC, July 2021, p. 15.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>","protected":false},"excerpt":{"rendered":"<p>Renovating marble: the grit sequence for sanding, what abrasion removes, the finishes not to rework, and when to call a professional.<\/p>","protected":false},"author":3,"featured_media":1827,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_meta-robots-noindex":"","_yoast_wpseo_canonical":"","_yoast_wpseo_opengraph-title":"","_yoast_wpseo_opengraph-description":"","_yoast_wpseo_opengraph-image":"","_yoast_wpseo_twitter-title":"","_yoast_wpseo_twitter-description":"","_yoast_wpseo_twitter-image":"","_yoast_wpseo_schema_page_type":"","_yoast_wpseo_schema_article_type":"","_yoast_wpseo_primary_category":"","footnotes":""},"categories":[49],"tags":[],"class_list":["post-3546","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-entretien-et-maintenance"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>R\u00e9nover du marbre : poncer, polir et savoir o\u00f9 s&#039;arr\u00eater<\/title>\n<meta name=\"description\" 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