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We just finished filling in a circular space under our Spruce with shale for a patio. The shale has color but seems dull when dry. Can it be sprayed with a sealer of any kind to retain the color is has when wet?
Acrylic seal coating will give your shale a gloss. There are several varieties at the home owners store or paint store.
Mineral oil would also impart some sheen. It is often used to seal porous soap stone kitchen countertops.
Thanks for the suggestion! Adding project to the top of the list.