There would seem based my own experience that there is a lot of confusion amongst the general public and some builders as to what sealing natural stone actually means.
When we talk about sealing a surface we normally mean that an impenetrable barrier is painted on or applied in some way. For example tiled floors are often sealed to give them added protection and make them shine. To do this a series of coats of emulsion polish are applied to the surface and allowed to dry. This seals the floor and gives it protection. Other surfaces such as wood are often sealed with a coating of a polyurethane product. This adds strength to the surface and protects it. Many other normally porous surfaces can be sealed with a layer that sits on the surface acting as a barrier to penetrative agents and gives protection also.
The sealing of natural stone such as marble, granite, limestone and slate is very different. Natural stone is made up of crystals that interlock together. The actual minerals that are present as crystals in the stone give it its colour and striations. However there are spaces between the crystal and the smaller these spaces are and the more the crystals have...
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