Coral Stone & Keystone Cleaning & Sealing

Coral stone is a beautiful but extremely delicate and porous stone. We use specialized, low-pressure techniques to safely clean and seal your coral stone patios, pool decks, and walls, protecting them from decay.

Is Your Coral Stone Turning Black, Green, or Crumbly?

Coral stone (or Keystone) provides a unique, luxurious look, especially for pool decks. However, its extreme porosity and softness make it a magnet for problems in the Texas climate:
  • Extreme Mold & Algae Growth: The stone's many holes and crevices are perfect breeding grounds for black and green mold and algae, which can make it dangerously slippery when wet.
  • Trapped Dirt: The porous texture traps dirt, dust, and grime, making the stone look perpetually dirty and grey.
  • Spalling & Crumbling: Coral stone is very soft and can easily be damaged by high-pressure washing, causing it to flake, crumble, and decay.
  • Staining: It will absorb spills like a sponge, leading to permanent stains from liquids, leaves, and suntan lotions.
  • Erosion: The stone can literally erode and wear away over time if not properly protected with a professional-grade sealer.

Our Specialist Process for Cleaning and Sealing Coral Stone

Deep Cleaning with Soft Wash Techniques
Step 1

We apply a high-quality, professional-grade algaecide and mold remover. This solution kills the organic growth at its root. We then use a very low-pressure, high-volume rinse (soft wash) to safely lift away the dead growth and deeply embedded dirt without harming the stone's fragile surface.

Thorough
Drying
Step 2

Coral stone holds a massive amount of water. We ensure the stone is absolutely bone-dry before sealing, often using air movers to accelerate the process. Sealing a damp stone would trap moisture and cause the sealer to fail.

Application of a Consolidating Sealer
Step 3

This is the most critical step. We apply multiple coats of a premium-grade, consolidating sealer. This type of sealer not only provides a protective barrier against water and stains but also penetrates deep into the stone to bind its particles together, strengthening it from the inside out and preventing future crumbling and erosion.

Don't Risk Destroying Your Beautiful Coral Stone.

Trust the experts. Contact us today for a free, on-site consultation and quote.

Frre Quote

Share Your Slate Service Experience

We value your feedback! If you’ve experienced our Comprehensive Slate Service—whether it was restoring worn floors, sealing outdoor patios, or refreshing kitchen countertops—please share your thoughts below. Let us know how Texas Stone & Restoration brought out the natural beauty and durability of your slate surfaces, and help future customers discover the difference expert care can make.

Frequently Asked Questions AboutCoral Stone & Keystone

My pool guy said he can pressure wash it. Is that okay?

Absolutely not. This is the single biggest mistake homeowners make. High pressure will blast away the surface of your coral stone, causing irreversible damage. It requires a specialist with the right low-pressure equipment and chemical knowledge.

No. We use high-quality, breathable, penetrating sealers that will not change the temperature of the stone, keeping your pool deck comfortable for bare feet.

Due to its extreme porosity, we recommend having your coral stone professionally cleaned and sealed every 18-24 months to ensure it remains protected and structurally sound.

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