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How to avoid that the holes in the stones become black with time? Is the sealer enough ? or to achieve better result would there be a need to filled the holes first and then sealed?
If you wanted to avoid the holes becoming full of dirt, your best option is to fill the holes with grout to stop build up of dirt, You will need to seal the stone either way but filling the holes will stop this issue, If you have any further questions don’t hesitate to contact us on 02 8728 7800.