What happens if sealer gets rained on?

Key Points:
✅ Sealer may become stained, cloudy, blotchy, or discolored if rained on while drying.
✅ It is best to apply sealant on a dry day and cover the area with plastic or a drop cloth if possible.
✅ Quick-drying sealants create a barrier of protection and should be used to protect surfaces from rain.
✅ Consult with a professional to ensure the appropriate sealant and application procedure is used.
✅ Proper surface preparation and application will help ensure long-lasting durability and protection.

My name is Emily, I am 23 years old and a DIY enthusiast. I have been gardening, repainting walls, and replacing broken tiles since my twenties and I can assure you that sealers play a crucial role in home improvement projects.

Sealant Type Reaction when Rained on during Drying
Latex May discolor or darken
Silane Resistant to water
Siloxane May become cloudy or blotchy
Epoxide Staining is possible


As someone who has been gardening, repainting walls, and replacing broken tiles since my twenties, I can assure you that sealers play a crucial role in home improvement projects.

Sealers are an essential part of woodwork, decking, and metalwork.

They protect against moisture, salt, and weather damage.

It is therefore important to understand what happens when sealer gets rained on before it has had time to dry.

To help explain this process further I have included a comparative table that lists the effects of sealing material’s exposure to rain before drying time is complete.

What is Sealant?

Sealant is a type of plastic or rubber material used to seal cracks and joints in surfaces like concrete and masonry.

This can prevent water from seeping in and causing damage, as well as keep out dirt, dust, and other airborne particles.

It is also used to improve the appearance of surfaces by smoothing out the edges between related objects.

The sealant comes in many forms including:

  • Epoxy-based products
  • Silicone-based coatings
  • Caulking materials
  • Acrylic lacquers for outdoor surfaces
  • Cold-applied asphalt emulsion sealers
  • etc.

Depending on the type of project you are doing there may be additional types of sealant available to you as well such as bitumen or plasticized rubberized asphalt mix.

Each kind has advantages and disadvantages so be sure you know which one will best suit your needs before making a purchase.

When applying sealant it should be applied with a suitable thin spreader or brush in an even layer that fully covers the surface being sealed.

Once dry the surface will normally become waterproof and resistant against wear but if left exposed it could gradually succumb to sun damage or mold buildup over time if left unsealed for long periods of time.

For this reason, it’s important that any sealant you use should be re-sealed as needed to ensure its longevity and protection from moisture and ultraviolet radiation damage due to exposure to sunlight – otherwise it could become brittle resulting in peeling off from its original place leaving unsightly rips or holes behind that can cause serious aesthetic issues if left unattended.

What Happens if Sealant Gets Rained On?

It can be frustrating when you’re trying to seal something outdoors and the weather doesn’t cooperate.

Having to pause your project when it starts raining can be incredibly frustrating, but it’s important to know what might happen to your sealant when it gets rained on.

In this article, we’ll discuss the potential outcomes of using sealant when it gets rained on, as well as how to minimize the risk of any negative effects:

Sealant May Become Stained, Cloudy, Blotchy, or Discolored

If sealant gets rained on while it is still drying, there may be adverse effects.

Depending on the type of sealant being used and the length of time it is exposed to precipitation, the sealant may become stained, cloudy, blotchy, or discolored.

There are also a number of factors that can influence how much damage rain will cause to an outdoor sealant job.

These include the type of substrate the sealer is applied to and the amount of rainfall or humidity that follows.

Additionally, temperature and sunlight can have an impact on the drying process.

If a surface gets too hot for too long or ends up in direct sunlight after application, then it may be at higher risk for discoloration from rain exposure.

Fortunately, there are ways to reduce the likelihood of damage if the sealer does get rained on before it has had a chance to dry completely.

The most important thing is that you clean up any residual water on a sealed surface as quickly as you can after rain exposure so that it doesn’t have time to seep into porous surfaces or saturate any exposed joint lines in a masonry surface.

Additionally, you should wait 12 – 48 hours before applying any other kind of weather protection (such as an overcoat) so that sufficient cure time has been established first.

Lastly, if there’s any kind of doubt about how well-sealed a surface will be after getting wet then you should apply an additional coat just to make sure there’s not a key precaution being missed out on during this critical curing period for sealers used outdoors.

Effects of Rain on Sealant Depending on Type

The effects of rain on the sealant can vary depending on the type of sealant being used.

Latex-acrylic sealers are usually the most resistant to water, but there is still a potential for damage if rained on during the drying process.

After a few minutes of exposure to rain, latex-acrylic sealers may become stained, cloudy, blotchy, or discolored.

These problems can occur if the sealer is disturbed by rainwater or if it gets scraped after drying in a partially dry state.

Polyurethane and epoxy sealants are more susceptible to rain since they contain volatile compounds that react with water.

They will remain wet for longer and should therefore be covered prior to and shortly after application until the curing process is complete.

If exposed to water too soon after application, these types of sealants may flake off or become soft and sticky. It’s important to choose an appropriate cure time according to your specific product when applying epoxy or polyurethane sealants.

It’s worth noting that any pre-existing cracks in concrete should be filled before sealing in order to ensure optimal protection from moisture damage as well as external pressure from snow or ice buildup.

Tips on How to Avoid Sealant Damage from Rain

Apply Sealant on a Dry Day

If possible, you should apply sealant products on a sunny, dry day when there is no forecast for rain.

This will help to ensure that the surface of your project is completely dry before the application begins.

Before you start sealing, double-check the forecast so that you can plan and be prepared with an alternate plan if needed – like applying a drop cloth over your project or putting away any tools that may get wet.

It’s recommended to avoid applying the sealant on windy days as well because these conditions can also cause premature curing or drying of the sealant, resulting in a poor finish.

In addition, excessive wind can blow dust and debris onto the surface of your project and interfere with adhesion.

When applied correctly during good weather conditions, sealants help keep outdoor projects looking great for years.

A colored waterproofing sealer not only enhances the look of stone and masonry surfaces around your home but also helps protect them from environmental damage while also preserving their natural beauty.

Sealants are typically water-based but very low VOC (Volatile Organic Compounds) formulations offer limited environmental impact and are safe for use around plants and people.

Cover the Area with Plastic or Drop Cloth

If the sealant is drying on a horizontal area, like a driveway, covered the surface with a heavy plastic tarp or drop cloth.

The tarp should extend at least two feet around the perimeter of the job area and be secured to avoid shifting with wind gusts.

If you’re unable to locate heavy plastic tarps, consider using overlapping drop cloths made from canvas or heavy waterproof fabric.

Finally, place long boards (1×3’s or 2×4’s) across the top of the tarp.

This will ensure it won’t come off in windy conditions and keep your project dry until you are able to finish your work.

In addition to protecting your surface against rain, using this method can also protect it against UV rays that can cause damage to sealers before they have time to cure properly.

Be advised that if curing time is prolonged for any reason, consider re-applying the sealer if necessary.

Use a Quick-Drying Sealant

Using a quick-drying sealant is an important step in protecting your surfaces from rain-related damage.

Non-quick drying sealants are more susceptible to water infiltration, leading to cracks and fading.

Quickly drying sealants create a barrier of protection that helps keep water out and maintains the integrity of the surfaces you are protecting.

Proper application is critical – make sure to read and follow the manufacturer’s instructions when applying any type of sealant.

The best way to ensure that the product you choose is suited for your surface and will create an effective barrier is to research before you buy.

There are several types of quick-drying sealants available that can be used on masonry, wood, and other surfaces, so be sure to select the one that best suits your needs.

Another factor in avoiding damage from rain is making sure that no area of the surface is left unsealed.

This includes around windows, doors, eaves, and other parts of buildings or vehicles that face exposure from rain or other elements, like snow or sun.

Professional sealing services can help you achieve a complete barrier against water penetration.

Additionally, having professionally applied to coat periodically inspected by experienced technicians can help detect any places where gaps have formed and need repair or resealing before any real damage occurs–a great way to maintain your profitability and safety for customers or clients who trust your services with their investments.

What Else To Know

Comparison of Different Types of Sealant

The following table provides an overview of the potential outcomes of sealing materials that are exposed to rain during drying:

Sealant Type Reaction when Rained on during Drying
Latex May discolor or darken
Silane Resistant to water
Siloxane May become cloudy or blotchy
Epoxide Staining is possible

Depending on which type of material you are sealing and desired end result, one should consider the reaction when sealant gets rained on while drying.

It is advisable to apply any kind of sealant on a dry day or cover the area with heavy plastic sheeting overnight if necessary. If it does get rained on, it is likely that in most cases some form of discoloration will occur, becoming cloudier, blotchier, darker, or stained in appearance.


After considering the effects of rain on sealer as it dries, I believe there are a few key points to consider:

  • Sealer may become stained, cloudy, blotchy, or discolored if rained on while drying.
  • Rain might wash away the sealer that has just been applied or cause it to bubble up.
  • It is best to consult with a professional who can advise you on the type of sealant and application procedure that is most appropriate in areas with frequent rain and humidity.

Ultimately, as long as you follow the manufacturers’ instructions and take extra caution when applying sealer around rainy weather, you should be able to avoid any major issues.

While there may be some discoloration in some cases, remember that proper surface preparation and application will help ensure long-lasting durability and protection.







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