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Yes, though this is part of the installation process so should have been completed by your installer. see Fixing and Sealing FAQ
Vacuum and sweeping is by far the best way to keep your floor free of dust and debris. For heavier soiling that requires water either spot clean using a spray bottle and clean rag or mop using a dedicated stone cleaner diluted into water. If you do mop try and mop as dry as possible as using lots of water will cause it to settle in the grout lines, evaporate away and leave dirt & grime behind.
There is no set frequency for resealing stone. Each installation experiences unique wear & tear so will age differently. See Fixing and Sealing FAQ The best protection you can give your stone floor is a good quality mat for people to wipe their shoes/boots on! Vacuum & sweep regularly and when you do mop use a dedicated stone floor cleaner.
A properly sealed stone floor will initially repel the wine. Wipe off the wine and wash with warm water. If wine is left on the floor it will eventually soak into the stone. This may fade in time and blend in with the natural characteristics of the stone.
Stone is very hard wearing and unlikely to scratch. If it does scratch, these will eventually disappear into the patina of the floor. Again, using a good quality mat is one of the best ways of protecting your stone floor.
No, do not reseal. The stain may vanish in time. If it is a bad stain, a Stone Restoration expert will need to be called.
No, all of the above substances will damage natural stone. Any cleaner that contains acid or is strongly alkaline will cause damage.
Yes, acids such as wine, orange juice, vinegar, etc. and strong alkaline like urine will damage both the sealant and the stone. Clean them immediately. DO NOT use limescale remover on natural stone as this will etch into the stone and there is no remedy for the damage this can cause.