Aggregate sealer protects and extends the life of exposed aggregate concrete by preventing wear and tear and dirt buildup. There are two types: wet look sealant provides a glossy finish but can be slippery, while penetrating sealants offer the highest level of moisture protection. Buyers should choose environmentally friendly products with UV protection. Application requires cleaning the surface and applying with a roller or brush, with a second coat often necessary.
An aggregate sealer is a protective finish used on some types of concrete flooring. It can consist of silicone, resins or even linseed oil, depending on the product. Standard concrete typically features a smooth, uniform surface, with all gravel and aggregate materials hidden from view. Some users prefer the look of exposed aggregate, which gives the concrete a textured surface. Just as concrete sealers protect standard concrete, an aggregate sealer can protect exposed aggregate.
The concrete used in exposed aggregate paving is typically very soft, which results in heavy wear over time. An aggregate sealant can slow this wear and tear and extend the life of the surface. It also protects concrete and aggregate materials from dirt buildup and helps maintain a clean, attractive finish.
Aggregate sealant comes in two basic varieties, each offering advantages and disadvantages. The inert wet look sealant forms a transparent film on the concrete surface. It offers a high level of protection against moisture and stains, but may darken the overall surface appearance of the aggregate. This type of sealer provides an attractive, glossy finish, but can be slippery. Wet look sealants tend to be the most cost effective product for sealing aggregates.
Penetrating sealants do not form a protective film on the aggregate surface. Instead, they dip into concrete to protect from the inside out. These sealants provide the highest level of moisture protection, but also tend to be the more expensive of the two. They are less resistant to staining than wet-look sealants and can only be applied to clean, unsealed concrete.
For most users, the key to a successful seal is balancing gloss and traction. While many users prefer the look of a glossy surface, glossy finishes are often slippery and dangerous, especially when wet. Some installers may add sand or other gritty materials to increase traction, while others may stick with penetrating sealants to maximize safety.
When choosing an aggregate sealant, buyers should look for environmentally friendly products labeled “Low-VOC.” This means that the product is free from volatile organic compounds, which pose a threat to health and the earth. It’s also important to look for products with built-in UV protection. This prevents yellowing or discoloration after years of sun exposure.
Many aggregate sealants are fairly simple to apply and require only basic tools. Before application, the concrete must be cleaned to remove any existing sealing layers. After that, the sealant can be applied using a standard roller or brush. A second coat is often required to ensure adequate protection. All aggregate sealants should be allowed to dry completely before any foot traffic enters the area.
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