How to Apply Flex Seal Liquid to Basement Walls

Do you have a wet basement and would like to keep it dry? If so, then flex seal liquid is a great product that can help. It’s easy to apply, effectively seals out moisture, and can last for several years with minimal maintenance. In this blog post, we’ll discuss the steps of how to apply flex seal liquid to basement walls correctly in your basement walls so that water never reaches them again!

How to Apply Flex Seal Liquid to Basement Walls

For those of you looking for a reliable and durable way to waterproof and insulate your basement walls, Flex Seal Liquid may be just what you need. An innovative product from the makers of Flex Seal Spray, Flex Seal Liquid is a proprietary rubberized coating that is ideal for sealing out water and air leaks in hard-to-reach places such as basements. This blog post will help guide homeowners through all the steps required to apply Flex Seal liquid correctly; from preparing the surface to curing times; this information can help ensure successful results the first time around. So read on if you’re ready to learn how easy it could be to waterproof your basement!

Why May You Want to Apply Flex Seal Liquid to Basement Walls?

1. To Seal Cracks and Holes in Your Basement Walls 

One of the main reasons you may want to apply Flex Seal Liquid to basement walls is to seal cracks and holes. This product forms a tight seal when applied, meaning it will prevent water from seeping in through any gaps or openings in your basement walls. It can also help protect against unwanted pests such as mice, rats, ants, and insects that could otherwise enter your home through these gaps.

2. To Reduce Moisture in Your Basement 

Flex Seal Liquid can also help reduce moisture in your basement by forming a waterproof barrier on the surface of your walls. This can help prevent water from entering your home and causing damage. It can also help protect against mold and mildew growth, which can be a health hazard.

3. To Enhance the Look of Your Basement Walls 

Flex Seal Liquid also adds a nice finish to your basement walls, giving them a more polished and attractive look. It comes in a variety of colors, so you can choose one that matches the decor of your home. Plus, it’s easy to apply and fast-drying, so you won’t have to wait long for the results.

Overall, applying Flex Seal Liquid to your basement walls is a great way to protect your home from water damage, reduce moisture levels, and make your basement look more attractive. It’s an easy and affordable solution that can help keep your home safe!

Adds a Nice Finish to Your Basement

How to Apply Flex Seal Liquid to Basement Walls in 5 Easy Steps

Step 1: Gather All The Materials You Need

The very first step is to gather all the materials you need in order to apply Flex Seal Liquid. This includes a brush or roller, tin snips, and a pair of gloves for protection.

Step 2: Prepare The Basement Wall

For best results, it is important that the surface area which you will be applying the sealant to is clean and free from dirt, grease, and other debris. Use a damp cloth to wipe away any dust or dirt from the wall before you begin.

Step 3: Cut The Flex Seal Liquid To Size

With a pair of tin snips, cut the Flex Seal Liquid into sections that will fit your basement walls. Make sure they are cut with clean edges so that the sealant will adhere properly to the wall.

Step 4: Apply The Sealant

Using a brush or roller, apply an even coat of Flex Seal Liquid to the walls. Make sure to cover all areas and pay attention to any corners or edges which may need additional coverage. Also you have to make sure to apply the sealant in a continuous motion.

Step 5: Allow The Sealant To Dry

Finally, allow all of the sealant to dry as directed on the product packaging before moving onto any additional work or covering up the walls. Depending on temperature and humidity levels, Flex Seal Liquid may take anywhere from 24-48 hours to fully dry, so it is important to be patient and give the sealant time to do its job.

Once the Flex Seal Liquid is completely dry, your basement walls will be fully sealed – providing you with an extra layer of protection against water damage, mold growth, and other potential hazards.

Some Tips to Apply Flex Seal Liquid to Basement Walls

1. Do Not Apply Heavy Coats

Not Apply Heavy Coats Layer in Wall

One of the most important tips before applying Flex Seal Liquid to your basement walls is to not apply heavy coats. Applying too much at once will cause it to run and create an uneven surface. Instead, apply thin layers, allowing each layer time to dry before adding the next one.

2. Prepare Surfaces Properly

Before applying Flex Seal Liquid, make sure to clean the surface of your basement walls. This will help ensure that the sealant can adhere properly to the wall. Use a stiff brush and hot soapy water for best results. Be sure to rinse well afterward.

3. Wear Proper Safety Gear

Whenever you are using any kind of liquid sealant, it is always important to wear the right safety gear. This includes gloves, goggles, and a face mask. The chemicals in the sealant can be hazardous, so make sure that you are properly protected at all times.

4. Prepare for Messy Situations

Flex Seal Liquid tends to be very messy when it is being applied. Make sure to cover any furniture or other belongings in the space to protect them from getting damaged. You may also want to lay down some newspaper or cardboard on the floor where you are working, as this will help make cleanup much easier afterward.

5. Allow Adequate Drying Time

Once you have finished applying Flex Seal Liquid to your basement walls, you should allow adequate time for it to dry. This will help ensure that the sealant has bonded properly and is ready to protect your walls from moisture and other elements. Make sure to follow the instructions on the package for best results.

Allow Adequate Time for It to Dry Wall Coat

Following these tips can help make applying Flex Seal Liquid to your basement walls much easier and more successful. Remember to take the necessary safety precautions and allow adequate time for drying, and your basement walls should be well protected from moisture and other elements. With proper application, Flex Seal Liquid can be an effective way to protect your home’s structure.

Frequently Asked Questions

What Precautions Should I Take Before Applying Flex Seal Liquid?

Before applying Flex Seal Liquid to your basement walls, make sure the area is clean and free of dust or debris. Also, ensure that the surface is dry and temperatures are between 40°F – 110°F (4°C – 43°C). Additionally, it’s important to wear protective gloves, a face mask, and safety goggles to avoid any potential irritation or inhalation of fumes.

How Should I Prepare the Surface Before Applying Flex Seal Liquid?

Before applying Flex Seal Liquid, make sure the surface is clean and free of dust, dirt, or debris. If you’re working with a painted surface, it’s important to sand the area first. Then, wipe down the surface with a damp cloth and let it dry completely before proceeding.

How Long Does Flex Seal Liquid Take to Dry?

Flex Seal Liquid usually takes about an hour or two to dry and can take up to 24 hours depending on humidity levels and temperatures. Once the liquid has dried, it is waterproof and will not peel or crack over time. Additionally, its strength increases over time to provide even more protection against leaks and water damage.

Is Flex Seal Liquid Safe for Basement Walls?

Yes – Flex Seal Liquid is safe for use on basement walls and provides a strong waterproof seal that won’t crack or peel over time. Additionally, it is non-toxic and does not contain any harsh chemicals so you can use it with confidence.

Flex Seal Liquid is Safe for Use on Basement Walls


Now you know how to apply flex seal liquid to basement walls! Applying Flex Seal Liquid to basement walls is a great way to protect your home from water damage. It’s an effective, affordable solution that is easy to use and will not take up too much of your time. With a few key steps, you can waterproof the walls without breaking the bank or hiring a professional. Remember, make sure the wall surface is clean before applying the Flex Seal Liquid so it can adhere properly. 

Also, maintain proper safety precautions when working with this product and always consult the instructions for additional guidance. By following these steps, you will be on your way to having a long-lasting waterproof barrier in place for years to come. So don’t wait any longer – get started now and enjoy the satisfaction of protecting your basement!

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