Its a good idea to use either an enhancing or non-enhancing impregnating Sealer after installing Pennsylvania Bluestone. Miracle 511 makes both products and either
is supposed to be food safe as well, for honed bluestone countertops. The enhancing sealer will darken the stone a bit and the non-enhancing variety will not change the appearance of the stone at all. Both sealers will lock out stains.
What can do with stains on bluestone that was never sealed?
Bluestone is porous so stains can be difficult to remove. For organic stains a 20/80 bleach water mixture can be sprayed on the affected area. Next scrub with a brush and rinse. Repeat if necessary. Grease and oil stains are impossible to get out of this porous stone. This is why sealer is recommended to seal the stone before a problem arises. Enhancing sealer may camouflage such a stain but it will never completely remove its appearance.