Hi Timmy, do you know what type of sealer has been applied to the limestone, is the sealer a topical coating or penetrating sealer? Also, what is the finish of the limestone, honed, tumbled, brushed etc? Also what type of finish is your customer expecting, knowing this information will help to offer you the correct chemicals and processes required to complete the job.
Finally, what type of machinery do you have to support this type of project?