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No, none of our cleaning products contains acid, they will not change the appearance or remove the colour from the stone.

In current European legislation, a biocide is defined as a chemical treatment that has been formulated to kill, destroy or have a controlling influence on an organic organism such as algae or lichen.

This term is used in relation to applying multiple coats of sealer. It means that the 2nd or 3rd coat of sealer needs to be applied before the previous coat has fully dried.

No, if left to long it might start to crystalise and dry white on the surface, but it will not damage the surface. If this does occur, it can be removed by either a stiff broom and water or a pressure washer.

Like many household cleaners, if applied concentrated to grass or plants, it will certainly harm if not kill them. This can always be avoided by saturating the adjacent areas with water prior to applying the cleaner and then rinsing off with copious amounts of water. This will then dilute the cleaner to the point where it will not harm grass or plants.

Internally or externally the sealer is normally touch dry after around 2-3 hours, always avoid over-applying the product.