First off, if you have porcelain or ceramic tiles that are not porous, they don’t need to be sealed. However natural stone tiles like marble, slate, granite, travertine and limestone do need to be sealed as they are naturally porous and will stain easily. When your stone tiles no longer bead water and you notice them taking on moisture and changing colour, they need to be resealed.
The first step is to apply a stone cleaner to the tiles to remove dirt and grease. Make sure to buff the tiles clean with a soft cloth, not an abrasive. Once your tiles are clean, you need to give them time to dry completely. You want them to return to their natural colour before you reseal them. This can take up to four hours.
Make sure to vacuum the tiles to remove any dirt or contaminants before you reseal the area. Once the tiles are prepared, use a foam paintbrush to apply the sealer onto the tiles with overlapping strokes. Remember to open a window or turn on a fan to ventilate the area.
Once applied, let the sealer soak into the stone for 10 minutes or so to allow the sealer to penetrate.
The last step is to remove the excess sealer by buffing the tiles with a soft cloth. You will want to work quickly to remove the excess. Then buff the area in the same sequence as the sealer was applied. Once you’re finished, the tile should not be sticky. Keep buffing the tiles until all the excess tile sealer is removed.
Remember to follow the manufacturer’s directions as not all sealers are the same.