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white marks on my newly sealed black limestone
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[QUOTE="DHTiling, post: 523900"] Hi Lucy.. This is a method statement from LTP for the cleaning of a patio just like yours with same acid washing etc... Wash surfaces thoroughly with a strong solution of LTP Grimex. This will help to break down and remove the sealer from the stone. Use undiluted onto the surface of the granite and then agitate immediately using a black pad or stiff brush, adding a little water whilst scrubbing. Do this for 20 - 30 minutes and rinse well with plenty of clean fresh water. Leave to dry 30 minutes. While the stone is still saturated with moisture we would suggest then washing the surface of the stone with a medium strength solution of acid in an attempt to even the discoloration of the stone caused by acid etching from the cement cleaners that were used. Apply a 1 : 3 solution of LTP Grout Stain remover to the surface of the stone and scrub evenly over the surface, Leave for 5 minutes, agitate again and then rinse thoroughly with plenty of clean fresh water. Leave to dry for 48 - 72 hours. To help restore the colour of the stone we would like to suggest LTP Stone Oil to deepen the colour followed by LTP Colour Intensifier for extra protection. Apply these products first in an inconspicuous area to help establish the optimum number of coats. Probably Stone Oil 2, Colour Intensifier 2. Allow 4 hours drying time between each application. [/QUOTE]
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white marks on my newly sealed black limestone
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