Can I Seal Concrete After Rain: Only Follow 4 Steps

Last Updated on February 6, 2023

The weather can take a toll on your concrete surfaces and cause a multitude of issues such as cracks, stains, and discoloration. Sealing concrete after rain may be an effective way to protect your surfaces from further damage while also improving their overall durability and moisture retention.

This can help ensure that your concrete surfaces remain in top condition for years to come. Sealing concrete has its advantages and disadvantages, so it is important to understand the risks before taking this step. In this blog post, we will discuss the advantages and disadvantages of sealing concrete after rain as well as provide some tips for doing so safely.

Can I Seal Concrete After Rain?

Can I Seal Concrete After Rain

Yes, you can seal concrete after it has rained. However, the most important factor to consider when sealing concrete is moisture content. If the moisture content of the concrete is too high, it can cause problems with the sealant’s adhesion and longevity. To ensure that the concrete is suitable for sealing after rain, wait until it is absolutely dry before applying a sealant.

The best way to determine if the concrete is ready for sealing is to conduct a calcium chloride test, which measures how much water vapor is present in the concrete. If the reading on this test exceeds 3 pounds per 1000 square feet in 24 hours, then it is advised that you wait until it falls below this limit before applying a sealant.

Steps for Sealing Concrete After Rain Without Damaging it

Preparing the Surface for Sealing

When preparing a concrete surface for sealing after rain, it is important to take several steps in order to ensure that the sealer will be applied properly and will not damage the concrete. First, it is essential to wait until the surface is dry before applying any sealer.

This typically involves waiting until the sun has had time to dry out any moisture that may be present on the surface of the concrete. After this, any loose dirt or debris should be scrubbed away using a brush and water or detergent.

Once all dirt and debris have been removed, a thorough cleaning should be performed with water and mild detergent. The entire surface should then be allowed to air dry completely before moving on to applying any sealers.

Choosing an Appropriate Sealer

Once the concrete surface is ready for sealing, it is important to select an appropriate type of sealer for the particular needs of your project. Generally speaking, there are two types of sealers film forming and penetrating and each comes with its own benefits and drawbacks.

Film forming sealers form a protective layer over the top of the concrete that helps protect against staining, fading, cracking, weathering and other common issues associated with outdoor surfaces exposed to elements such as rain.

On the other hand, penetrating sealers penetrate into porous surfaces such as concrete in order to help protect against moisture coming into contact with them while also helping them resist mildew growth and other forms of degradation over time. Depending on your specific needs, one or both types of sealers may be appropriate for use on your particular project.

Applying Sealer in Even Layers 

Once you’ve selected an appropriate type of sealer for your project, it’s time to begin applying it in even layers across your entire concrete surface. For best results when applying a film-forming layer of sealer, start by painting an even coat across one section at a time using a paint roller or spray gun depending on your preferences.

Make sure that no area is left uncovered so that you get full coverage from top-to-bottom as well as from side-to-side. Once this first layer has been applied according to manufacturer’s instructions, allow it enough time (usually 24 hours) to set before adding additional coats as necessary based on manufacturer’s recommendations for optimal protection from rain damage over time. 

Maintaining Regularly Scheduled Sealing Regimens 

Finally, maintaining regularly scheduled sealing regimens can help keep your concrete safe from damage caused by rainwater over extended periods of time without requiring too much effort or expense on your part as long as you follow proper steps when initially sealing and re-sealing areas around your home or business with film forming or penetrating layers of sealant every few years (depending on level use).

Although certain areas may require more frequent applications than others due to higher levels of exposure/use/traffic etc., keeping up with regular maintenance schedules can help ensure that these surfaces remain protected from possible damages caused by rainwater so that they look their best year after year!

Advantages of Sealing Concrete After Rain 

Sealing concrete after rain can provide a number of benefits to homeowners, businesses, and other concrete users. By sealing the surface, you can create a protective layer that resists staining, scratches, weather damage, and even oil and chemical spills.

It also helps to retain moisture in the concrete which is essential for its long-term durability. Furthermore, the sealant creates a uniform look to the surface without reducing natural color variation. 

Long Term Durability 

One of the main benefits of sealing concrete after rain is improved durability and moisture retention. When water gets into the pores of the concrete it can cause it to crack or flake over time as freezing temperatures cause it to expand and contract.

The sealant forms an impermeable layer on top of the porous material that stops moisture from getting through and causing structural damage. This makes your surfaces last longer by protecting them from wear and tear over time. 

Resistance Against Stains & Weather Damage 

By sealing concrete after rain you can increase its resistance against stains from oil, chemicals spills, dirt or food spills. This is especially useful if you are using your concrete for outdoor purposes such as driveways or patios where these types of contaminants could accumulate quickly if not sealed properly.

Sealing your surfaces also provides better protection against weather damage as harsh sunlight or extreme cold temperatures won’t be able to penetrate as easily through a protective sealant layer. 

Increased Oil & Chemical Resistance 

If you are using your concrete in an area that may come into contact with oil or other chemicals then sealing it afterwards will help protect it against staining and other damage that can occur when these substances make contact with unprotected surfaces.

The sealant will act as a barrier that repels any liquid substances, meaning that they won’t be able to get into the pores of the concrete where they could cause discoloration or deterioration over time. 

Disadvantages of Sealing Concrete After Rain

Increased Risk of Damage or Contamination

When concrete is sealed after rain, the water can become trapped underneath the sealer and cause additional moisture buildup that could lead to deterioration. This could then lead to cracks in the surface or even spalling, where chunks of concrete fall off from the surface due to erosion.

Moisture buildup can also increase the risk of contamination from substances like oil and dirt, which could result in discoloration or other blemishes on the concrete’s surface.

Inadequate Protection Against Certain Types of Damage or Contaminants

Sealing concrete after a rain event can sometimes leave it more vulnerable to certain types of damage and contaminants due to incomplete coverage caused by gaps between the sealer and concrete surface.

These gaps might not be completely filled, leading to some areas being left unprotected, which could result in staining, fading, cracking and other forms of damage over time. Furthermore, these areas might also be more susceptible to contamination, either from oil stains or dirt that accumulates within them. 

Reduced Natural Color Variation Due To Uniform Sealing 

Sealing a concrete floor after rain can often lead to reduced natural color variation due to uniform sealing across all sections of the floor. This not only reduces its aesthetics but also makes it less visually appealing as well as practical for certain applications such as interior design projects or even commercial settings like retail stores.

The lack of natural color variation also prevents homeowners from making use of creative design elements on their floors without sacrificing protection from outside elements like water and dirt.

Steps for Sealing Concrete After Rain Without Damaging it

What Is The Best Time To Seal The Concrete?

The best time to seal your concrete depends on several factors, such as temperature and weather conditions. Generally speaking, if possible, wait at least four weeks after pouring your concrete before you begin sealing it.

This gives the slab adequate time to cure and harden completely so that any moisture trapped within will dissipate completely over time without compromising the integrity of your slab or the performance of your sealant. Furthermore, make sure that any standing water has completely evaporated off of your slab before attempting to apply a sealant.

How Do You Dry Concrete Before Sealing It?

When drying concrete prior to sealing it, there are several methods available depending on your specific needs and budget constraints. Some of these methods include using dehumidifiers or fans/blowers to draw moisture out from inside and around the surface of your slab; laying down absorbent material such as kitty litter or wood chips overnight.

Placing containers filled with hot water within a few feet from your slab; and spraying hydrogen peroxide directly onto affected areas of your slab (for small-scale projects). In addition, be sure to monitor ambient humidity levels and consult an expert if necessary for further advice on drying out your specific area before attempting a sealing project.


Sealing concrete after rain may be a great way to protect your surface from further damage and improve its overall durability. However, it is important to consider both the advantages and disadvantages associated with sealing before making any decisions.

Additionally, it is essential to follow specific steps when sealing your surface in order to prevent damaging it in the process. By understanding the pros and cons of sealing concrete after rain as well as following proper procedures for doing so, you will be able to maintain a healthy and beautiful surface for many years to come.

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