Ghostshield Siloxa-Tek 8500 Penetrating Concrete Sealer Review (2026)
By Nate Sawyer, Editor · Updated July 2026
DIYPicks is reader-supported. As an Amazon Associate and affiliate of home-improvement retailers, we may earn a commission when you buy through links on our site — at no extra cost to you. This never affects our recommendations.
- Concrete driveways in freeze thaw and road salt climates
- Keeping a natural no sheen look
- Long term waterproofing without a slippery film
A DOT-approved water-based silane/siloxane that soaks into concrete to form an invisible water and salt repellent barrier. It is the go-to for freeze-thaw and road-salt protection without any slippery film, but it adds zero visual enhancement.
Pros
- Penetrates and reacts below the surface, so it does not peel, yellow, or make the driveway slippery
- Strong salt and chloride repellency makes it well suited to freeze-thaw and deiced climates
- Leaves the concrete looking completely natural with no sheen or color change
Cons
- Provides no wet-look or gloss enhancement, so it will not revive dull or faded concrete visually
- Higher upfront cost per gallon than acrylic or asphalt sealers
- Only works on porous, unsealed concrete - it cannot be applied over an existing film-forming sealer
Specifications
| type | Water-based silane/siloxane penetrating sealer (DOT approved) |
|---|---|
| surface | Concrete, brick, masonry, pavers |
| finish | Natural, no gloss (invisible) |
| coverage | Up to 250 sq ft/gal per coat (ready-to-use) |
| protection | Repels water and deicing salt/chloride; reduces freeze-thaw damage |
| application | Low-pressure sprayer, roller, or brush |
| slipRisk | Does not change surface traction |
| durability | Long-lasting sub-surface barrier |
Frequently Asked Questions
- Will Siloxa-Tek 8500 change how my concrete looks?
- No, and that is the point. It penetrates and reacts below the surface rather than forming a film, so it leaves the concrete completely natural with no gloss or colour change. If you want a wet-look that revives dull or faded concrete, this is the wrong product — you want an acrylic sealer instead.
- Can I apply it over concrete that is already sealed?
- No. It only works on porous, unsealed concrete and cannot be applied over an existing film-forming sealer. Test with water first: if it beads instead of soaking in, there is a sealer already there and it has to come off.
- Is it worth the higher price over an acrylic sealer?
- In freeze-thaw and deiced climates, often yes. Its strong salt and chloride repellency targets exactly the mechanism that destroys driveways in cold regions, and because it does not form a film it will not peel, yellow or turn slippery. In a mild climate where you mainly want appearance, a cheaper acrylic does more for the money.
- How much does a gallon cover?
- Up to about 250 sq ft per gallon per coat in its ready-to-use form. It is DOT approved, which is a useful signal of the durability standard it was tested against.