Three yellow stain patches appeared on my granite benchtop which is only 3 years old and we had recently resealed. Unknown what had caused it. Grand Stone Repairs were very accommodating, happened to be in suburb nearby so called in and used their Italian product on the marks. Within about 15 minutes the patches were completely gone and I was able to buy some of their product. Would recommend Grand Stone Repairs highly for their service and product. The representative even knew the name of my granite at first sight so I was impressed with their knowledge.