One of my fabrication contractors is installing 10,000 sf of Portuguese limestone in a commercial building in the lobby area. He provided the name but unfortunately I don't have it at hand. Needless to say this material is on the soft side. His question is what would we recommend to densifyer or harden the stone?

Please share your thoughts and experience on this matter. Is the prime grind hardner a good suggestion? Has anyone used a densifyer and followed up with a lithium based guard product?

Thanks for your time and help regarding this matter.

American Stone Care, Inc.