mudster
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Firstly, don't seal the tiles before you fit them, they should be a fitted raw with a white powdered adhesive and allowed to dry. 24 hrs is generally enough. This is actually because sealing the tiles first doesn't completely stop moisture ingress but it does stop the stone drying out completely, effectively it actually traps moisture in the stone as it doesn't allow it to breathe.
If the stone is 10mm thick or less it is suitable for use on regular domestic walls, if it's 12mm or thicker it sin't unless the walls are constructed in a certian way.
*Technical bit* Ardex produce a specialist adhesive called S20W designed for fast track stone installations, it traps all the moisture in the adhesive and doesn't allow it to seep into the stone, ironcially though it can't be used in wet areas so is no good for bathrooms.*End of technical bit*
Then seal with Lithofin Stain Stop MN once everything is dry. Theres no hard and fast number of times to seal it, you simply keep applying sealant until the stone stops soaking it in. Allow to dry overnight - keep the room well ventilated.
Grout, using a 50/50 mix of wall and floor grout, personally I'd use BAL Ivory wall+ BAL Ivory wide joint fill the holes with grout as much as possible and clean as you go.
Leave for 24 hrs then resael making sure you seal the grout as thoroughly as the stone, any sealant or grout resdue can be removed with a soft cloth damned with the sealant itself then a qucik wipe witha cotton cloth after that.
For the sealants, click on my site in the link below and click on "Order Sealants and Cleaners" this will direct you to the distributors website of the sealant product, it's available there cheaper than anywhere else on line, you're not buying from me, but directly from the distributor.
1 Ltr will be enough for a single shower, but I'd also advise you buy a bottle of Easy care to take care of the stone, you can get chemical reactions from the bleach laden cleaners sold in the supermarkets.
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