mudster
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There's limestone and there's limestone, we sell quite a variety for different installations, some is so dense it's suitable for shopping centres and factories, other types aren't so hardwearing and are suitable for low traffic domestic installations only.
We recommend Lithofin Stain Stop MN as a sealing impregnator, it's far more expensive than similar products and you'll use a lot of it on the initial fit, but the main advantage it has over other products it it's longevity. After installation in domestic circumstances it's good for 5-6 years and we only generally recommend resealing shower areas once a year.
Maintainance should be with Lithofin Easy Care, this then doesn't attack the stone or the chemicals used to seal it and makes everything last a lot longer.
The bottom line is, if it's installed and sealed correctly and you pick a suitabale stone for your circumstances it will be a long lasting a beautiful floor.
Specifically for CWatters -
The finish of the stone has little or no effect on the porosity, the same stone with a honed, polished or brushed finish will still have the same porosity and requre the same treatment.
If a stone is described as honed and filled, it's highly unlikely to be limestone - but rather travertine, which is generally a cheaper product, (although fundamentally still calcium carbonate it's formed sligthly differently).
The denisty of the product is directly related to how much sealant is required, so there's no hard and fast number of coats of sealant that need to be applied, you simply keep applying until the stone stops soaking it up, at this point, there's no room left for anything else to soak into the stone and that is fundamentally how an impregnating sealer works.
It also has the added advantage of not changing the appearance of the stone in any way.
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