To determine if any surface needs sealing, SIMPLE, pour water on it in a few different areas and wait 20 minutes. If the water does not enter the surface you have a sealed surface. If it enters the surface it needs to be sealed. For the type of tile you are talking about a penetrating sealer is what you want to use.
sloggi said:i posted on this recently, i was advised that porcelain costing €60 per sqm or above would not require sealing! below that, especially chinese porcelain would need to be sealed.
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