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Complete guide to water-repellent treatment for porous limestone

Guida completa al trattamento idrorepellente per pietre calcaree porose

The protective treatment of porous stone materials is essential to prevent degradation caused, directly and indirectly, by water absorption. Natural stone surfaces, especially those exposed to the outside, require specific care and treatments to preserve their beauty and integrity over time. In this article, we will explore the importance of treating porous limestone correctly.

Overview of porous limestones and degradation phenomena

Limestones are sedimentary rocks composed almost exclusively of calcite, which is a mineral made up of calcium carbonate (CaCO 3 ). The porous types of these stones are characterized by a structure that allows a high absorption of water and the substances dissolved in it (salts, pollutants, carbon dioxide, oxygen, etc.), making them particularly vulnerable to various degradation phenomena (physical, chemical, biological and anthropic).  

The water that penetrates into the stone material can have different origins: rainwater, condensation humidity, rising humidity and leaks from the water system. Lecce stone, Carparo, calcareous tuff and travertine are typical examples of limestone which, due to their high porosity, require protective treatments to avoid structural damage, chromatic alterations and the formation of surface dust.

The importance of correct protective treatment

Treating porous stones correctly is essential to preserving their aesthetics, functionality and structure. An ineffective or inadequate treatment can lead to problems such as yellowing, the formation of surface films and induce an acceleration of degradation processes. These problems are often caused by the use of products that are not fully compatible with specific supports and which, therefore, do not offer long-lasting protection.  

In the worst cases, unsuitable products can create a non-breathable barrier which causes the detachment of the outermost part of the treated surface of the stone (the so-called "plug effect"). A suitable protective product must, however, create an invisible film capable of blocking the penetration of liquid water from the outside to the inside of the stone ( water-repellent effect ) and, at the same time, be permeable to water vapor present inside the stone material , allowing it to escape naturally ( breathable effect ).

Camp's solution: Hydro Pro Eco Tufo and Pietra Leccese

Camp has developed an innovative solution for the treatment of porous limestone with Hydro Pro Eco Tufo and Pietra Leccese , a water-repellent and surface consolidating protectant in aqueous solution. This product has been designed to offer long-lasting and non-invasive protection, thanks to an optimized formula that penetrates deeply into the micro-cavities of the stone, creating a protective barrier against water, humidity, soluble salts, smog and other pollutants.

Water-repellent treatment for external Lecce stone
Application of Hydro Pro ECO Tufo and Pietra Leccese on Leccese stone, one year after the treatment. On the right, on the unprotected part you can notice the formation of mold and blackening.

Benefits of the treatment  

The benefits of using Hydro Pro Eco Tufo and Pietra Leccese are multiple. In addition to offering long-lasting protection, the product does not modify the original appearance of the surfaces and leaves their breathability unchanged. Furthermore, it counteracts phenomena such as capillary rise and the formation of saline efflorescence, crusts, patinas, mold and algae. Furthermore, it chemically binds to the micro-cavities of the stone in order to ensure a good surface consolidating action and aggregate the dust present on the surfaces to be treated. Its ecological formula, free of Volatile Organic Compounds (VOC), also guarantees respect for the environment.

Preparation of surfaces for treatment

Before applying Hydro Pro Eco Tufo and Pietra Leccese, it is essential to adequately prepare the surfaces. Make sure surfaces are dry, well seasoned and free of water, debris, dust, oils and residues from previous treatments. Clean the surfaces beforehand with AlcaDet and, if mold is present, use Rimuovi Muffa and Muffa Control Risanante. Any cracks or cavities must be carefully repaired.

How to apply Hydro Pro Eco Tufo and Pietra Leccese

Hydro Pro Eco Tufo e Pietra Leccese is ready to use and must not be diluted. Apply the product with a brush, roller or low-pressure nebulizer, spreading it evenly until saturated ("waste" application). Apply several coats continuously, wet on wet. On vertical surfaces, apply from bottom to top.

Precautions during treatment

The treatment, like all treatments of this type, is irreversible and must be carried out according to the instructions for use indicated (for further information consult the product technical data sheet). Protect glass, window frames, plants and other non-porous surfaces. Make sure that the surface temperature is between +5 and +40 °C during application and protect from rain for at least 4 hours after treatment. Do not use on ceramic, wood, plastic, metals or non-porous materials.


Understanding how to carefully treat porous limestone is essential to ensuring its longevity and beauty. The Hydro Pro Eco Tufo and Pietra Leccese di Camp water-repellent treatment offers an effective and long-lasting solution, preserving the integrity of natural stone materials without altering their appearance.

Water-repellent impregnator in aqueous solution with high penetrating power, colourless, long-lasting, dust-proof and dirt-proof, suitable for the protection of natural stones.
Specific for the treatment of mineral supports and highly porous surfaces. Creates a protective barrier against water, humidity, rain, frost, smog and pollutants.

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