Yes, you should seal your concrete because it's porous and needs protection from moisture, stains (oil, grease, dirt, salt), and weather, which extends its life, prevents cracking/spalling, makes cleaning easier, and enhances its appearance with added color or sheen, though you must wait about 28 days to cure new concrete before sealing. Sealing is like sunscreen for your driveway, crucial for long-term durability and value.
Concrete sealers have disadvantages like creating slippery surfaces, requiring frequent reapplication (maintenance cost), potential for uneven appearance/fading, trapping moisture (causing blisters/peeling), and containing harmful VOCs, with solvent-based types posing fire/health risks, while application errors (wrong prep, timing, product) can lead to premature failure, bubbling, and stains, making proper selection and application crucial.
Leaving concrete unsealed will leave it with a flat look. The color will remain flatter and dull, in addition to the concrete remaining porous and easier to damage. Sealing the concrete will enhance the colors and give it more of a marble or mottled look, smoother and with richer colors.
We recommend that all types of exterior concrete should be sealed including plain concrete, exposed aggregate, stamped concrete, stained concrete, integrally coloured concrete, stencilled concrete, engraved concrete and overlays. Each surface lends itself to unique needs when it comes to applying the right sealer.
Without sealant, water can seep into a concrete driveway and lead to considerable damage over time, especially in areas known to fall below freezing during the winter months. Water seeps into the pores, then freezes and expands, which can lead to significant cracks.
Sealing your driveway protects it from damage from the elements and vehicle fluids. Sealant keeps your driveway looking good and extends its life. Driveway sealing saves you money in the long run.
When To Apply Pavement Sealer. Pavement sealer is generally applied from April 1st to October 31st. This is because manufacturers specifications call for temperatures of 50 degrees and rising.
If concrete is left unsealed, a number of issues can occur over time: Surface staining from oil, grease, dirt, or rust. Moisture damage including cracking, spalling, and weakening. Mould and mildew growth, especially in damp or shaded areas.
Late winter, early spring, and fall offer the most suitable conditions for sealing concrete in the Southeast, with temperatures ranging from 50° F to 80° F (10° C to 27° C). Sealing your concrete during this time allows for proper curing and maximum protection.
Yes, you can skim concrete over existing concrete for resurfacing, often using a thin concrete overlay or microcement, but success depends heavily on proper surface prep: thoroughly clean the old concrete, repair cracks, and apply a strong bonding agent to ensure the new layer adheres well and lasts, preventing issues like peeling or cracking. Skim coating, also called micro-topping, provides a new, updated look for floors, patios, and even vertical surfaces.
The 20/30/40 rule in concrete is a simple guideline for mix proportions, suggesting roughly 20% cementitious materials, 30% water + admixtures (for workability), and 40% aggregates (sand and gravel), providing a good balance for quality and economy. While often linked to a broader 10-20-30-40 rule (10% cement, 20% water/air, 30% sand, 40% gravel by volume), the 20/30/40 emphasizes the key component percentages for a practical mix, especially for achieving good strength and pumpability.
5 Signs Your Concrete Needs to Be Sealed (and Why It Matters)
You can seal old concrete any time as long as no old sealing products are apparent. To know when to reapply topical concrete sealers, look for signs of wear, flaking, or discoloration.
Average Lifespan of Sealed Concrete
A professionally sealed concrete surface can last anywhere from 3 to 10 years or more, depending on the type of sealer used, the environment it's in, and how well it's maintained. Here's a general guide: Acrylic Sealers: 1–3 years (ideal for indoor spaces or decorative finishes)
The answer depends on the surface's square footage. For large surfaces such as commercial floors, a sprayer is faster and way more efficient. Finally, for small surfaces, such as garages or any other exterior surface, a paint roller or any other type of roller will do the trick. Rolling is a less expensive process.
The "best" concrete sealer depends on the application: Epoxy offers extreme durability for indoor garages/retail (not UV-stable). Polyurethane is tough for high-traffic/driveways, providing gloss. Acrylics (water/solvent-based) are cost-effective, good for residential/driveways, offering wet looks or natural finishes. For natural, outdoor finishes, penetrating sealers (silanes, siloxanes) seal pores without altering look.
Mistake #2: Sealing before Full Cure
Sealing before your patio is fully cured is a recipe for disaster. Concrete needs time to release moisture and fully harden. Rush this process, and you're looking at a weakened surface prone to damage and an ineffective seal.
The "90-minute concrete rule" was a standard guideline (ASTM C94) requiring ready-mix concrete to be discharged from the truck within 90 minutes (1.5 hours) of mixing to ensure workability and quality, but this rule has been updated, allowing for custom time limits to be set by the purchaser and producer, acknowledging modern admixtures that extend working time, though the original principle of limiting time to maintain quality remains crucial.
Water-based sealants are easy to apply, making them another good choice for DIY projects. It's important to note that water-based sealant can't be applied on concrete that has been previously sealed with a solvent-based sealer.
Drawbacks of Driveway Sealcoating
One is that it can be messy and difficult to apply evenly. It's also important to note that sealants will not repair significant damage to your driveway; they will only protect it from further damage. If your driveway is damaged, you'll need to have it repaired before sealcoating it.
A 4-inch concrete slab typically takes 28 days to fully cure and reach 99% of its maximum strength. Initial curing occurs within 24-48 hours, allowing for light foot traffic after 24 hours.
Sealing helps prevent the concrete from absorbing water, which is a common cause of cracks in cold weather when water freezes and expands within the concrete.
Temperatures below the minimum 50 degrees Fahrenheit are too cold for sealing driveways. Furthermore, if the low temperatures fall to freezing or below while the coating dries, water in the sealcoat material could freeze, leading to the finished product separating and peeling.
The Best Conditions for Sealcoating
The best time to seal coat your asphalt driveway is during the fall, between September and November. Seal coating should not be done when temperatures are below 55 degrees Fahrenheit or above 90 degrees Fahrenheit.
It's best to seal your driveway in the fall or the spring because the temperatures tend to be more moderate. In order to put seal coating on, the outside temperatures need to be above 50 degrees Fahrenheit. In addition, the weather needs to be free of heavy rain for 24 hours.