Sealing slate floor tiles
Asked by... Dave Smith from London

The Question

Can you confirm if sealing slate floor tiles prior to grouting is correct and is one coat sufficient, and then should a second coat be applied once the grouting has been completed.
 

The Answer

Hello Dave

Our recommendations would be to give your slate tiles a coat of sealer prior to grouting but your floor must be dust and dirt free before you give the slate a first light coat of sealer.

Once you have grouted your slate tiles then we recommend another light coat of sealer. It is always advisable whichever stone you choose to do a water test when the sealer is dried which can take up to 48 hours to be fully dried.

A water test involves filling an egg cup with clean water then pouring this onto one part of your dried slate flooring and then should be left for 2 hours. If when you return the water has dispelled into the stone then you need to apply a further light coat of sealer.

If after sealing the slate floor tiles this has been done correctly then you will be left with a pooled group of water sitting on the surface, the same as you would see droplets on a window when it's raining.

- asked before 2013
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