Can You Paint Over Flex Seal and How To: A Step-by-Step Guide

Bob Thomas


Flex Seal is a popular product for sealing leaks and cracks, but what if you want to change the appearance of the surface after applying it?

Can you paint over Flex Seal?

The answer is yes, you can!

In this article, we'll provide you with a step-by-step guide on how to paint over Flex Seal, ensuring a professional and long-lasting finish.

Quick Summary

To paint over Flex Seal, follow these steps: 1) Clean the surface, 2) Lightly sand the Flex Seal, 3) Apply a primer, 4) Paint with a compatible paint, and 5) Add a protective topcoat if desired. By following these steps and using the right materials, you can achieve a seamless finish that covers the Flex Seal and looks great.

Clean the Surface

Before painting over Flex Seal, ensure the surface is clean and free of dirt, dust, or debris.

You can use a mild detergent and water mixture to clean the area, then rinse it thoroughly and let it dry completely.

Lightly Sand the Flex Seal

Once the surface is clean and dry, lightly sand the Flex Seal with a fine-grit sandpaper (around 220-grit) to create a slightly rough texture.

This will help the primer and paint adhere better to the surface.

Be careful not to sand too hard or remove the Flex Seal, as it may compromise its sealing properties.

Pro Tip: Use a sanding block to evenly distribute pressure while sanding, preventing gouges or uneven spots.

Apply a Primer

Before painting, apply a primer that is compatible with both Flex Seal and the type of paint you plan to use.

For best results, use a water-based acrylic primer.

Apply the primer in thin, even coats, allowing each coat to dry according to the manufacturer's instructions.

Paint with a Compatible Paint

Now that the primer has dried, it's time to paint over the Flex Seal.

Choose a paint that is compatible with the primer and Flex Seal, such as a water-based acrylic paint.

Apply the paint in thin, even coats, allowing each coat to dry according to the manufacturer's instructions.

Two coats are usually sufficient for proper coverage.

Add a Protective Topcoat (Optional)

If desired, you can apply a protective topcoat to seal and protect the painted surface.

Choose a clear, water-based acrylic sealer for best results.

Apply the topcoat in thin, even coats, allowing each coat to dry according to the manufacturer's instructions.

Popular Flex Seal Products And If They Can Be Painted Over

Most of these products can be painted over.

Here's a list of some popular Flex Seal products and whether they can be painted over:

  1. Flex Seal Liquid Rubber Sealant Coating (Spray): This spray-on rubber sealant is one of the most well-known Flex Seal products. It can be painted over with most acrylic or latex-based paints.
  2. Flex Seal Liquid: Flex Seal Liquid is a brush-on, pourable version of the original Flex Seal rubber sealant. It can also be painted over with most acrylic or latex-based paints.
  3. Flex Tape: This waterproof adhesive tape can be used to repair leaks and seal cracks. It is paintable, but it's essential to choose a paint that adheres well to the tape's surface.
  4. Flex Glue: Flex Glue is a waterproof adhesive that can bond various materials together. It can be painted over once fully cured, but the paint might not adhere as well to the glue as it does to the other Flex Seal products.
  5. Flex Shot: Flex Shot is a thick rubber adhesive sealant that comes in a caulking gun-like applicator. It can be painted over with most acrylic or latex-based paints.
  6. Flex Paste: This rubberized paste is used for sealing and filling large gaps and cracks. It can be painted over with most acrylic or latex-based paints once fully cured.
  7. Flex Mini: Flex Mini is a smaller version of the original Flex Seal Spray. It has the same properties and can be painted over with most acrylic or latex-based paints.

Safety, Risks, and Considerations

When working with Flex Seal and painting over it, it's essential to follow safety precautions and be aware of potential risks and considerations.

Here's a list of points to keep in mind:

Proper Ventilation: Ensure that the area where you're working is well-ventilated to avoid inhaling fumes from Flex Seal, primers, or paints.

Personal Protective Equipment (PPE): Wear appropriate PPE, such as gloves, goggles, and a mask or respirator, to protect your skin, eyes, and respiratory system from potential irritants.

Surface Preparation: Thoroughly clean and dry the surface before applying Flex Seal, primer, or paint to ensure proper adhesion and minimize the risk of peeling or chipping.

Compatibility: Test a small, inconspicuous area of the surface with the primer and paint you plan to use to ensure compatibility with Flex Seal.

This helps avoid potential adhesion issues or damage to the surface.

Paint Drying Time: Allow adequate drying time between coats of primer and paint, as well as between the final coat of paint and using the surface.

Rushing this process may lead to improper curing and reduced durability.

Flammability: Be aware that some paints, primers, and Flex Seal products may be flammable. Avoid using them near open flames, sparks, or high heat sources.

Storage and Disposal: Store unused Flex Seal, primer, and paint in a cool, dry place away from heat sources or direct sunlight.

Dispose of empty containers and waste materials according to local regulations.

Keep Out of Reach of Children and Pets: Ensure that Flex Seal, primer, and paint products are stored securely and out of reach of children and pets to avoid accidental ingestion or exposure.

By adhering to these safety measures, risks, and considerations, you can effectively and safely paint over Flex Seal while minimizing potential hazards.


In case you encounter any issues while working with Flex Seal and painting over it, this troubleshooting section will help you address some common problems:

Incomplete Coverage: If the Flex Seal doesn't provide even coverage or has visible gaps, apply additional coats as needed, allowing each coat to dry before applying the next one.

Poor Adhesion: If the primer or paint isn't adhering well to the Flex Seal, ensure that the surface was thoroughly cleaned and dried before application.

You may also need to consider using a different primer or paint that's compatible with the Flex Seal product.

Bubbles or Wrinkles: If bubbles or wrinkles appear in the paint or primer, ensure that the Flex Seal is completely dry before applying primer or paint.

Additionally, make sure you're applying thin, even coats and allowing each coat to dry before applying the next one.

Chipping or Peeling: If the paint or primer starts chipping or peeling, it may be due to inadequate surface preparation, insufficient drying time between coats, or using incompatible products.

Address these issues by properly preparing the surface, allowing enough drying time, and using compatible products.

Uneven Paint Finish: If the paint finish appears uneven or patchy, apply additional coats as needed, ensuring that you allow each coat to dry properly. Using a high-quality paint and the right application technique can also help achieve a more even finish.

Fumes or Odor: If you're experiencing strong fumes or odors during the painting process, make sure you're working in a well-ventilated area.

If the smell persists, consider using low-odor or low-VOC (volatile organic compound) paint products.

Difficulty Removing Flex Seal: If you need to remove Flex Seal after it has cured, try using a plastic scraper or a soft-bristle brush to gently remove the material without damaging the surface.

You can also use a hairdryer or heat gun to soften the Flex Seal, making it easier to remove.

By addressing these common troubleshooting issues, you can ensure a successful and smooth painting process over Flex Seal, resulting in a durable and aesthetically pleasing finish.

Frequently Asked Questions Section (FAQs)

Q. Can I use any type of paint to paint over Flex Seal?

  A: While Flex Seal can be painted over with most paints, it's essential to choose one that's compatible.

Acrylic and latex-based paints are usually the best options for adhering to Flex Seal surfaces.

Q. Do I need to prepare the Flex Seal surface before painting?

  A: Yes, proper surface preparation is crucial for achieving a long-lasting paint job.

Clean the Flex Seal surface, ensuring it is free of dirt, debris, and grease.

If the surface is glossy, lightly sand it to create a slightly rough texture, which helps the paint adhere better.

Q. How long should I wait for the Flex Seal to cure before painting?

  A: It's essential to allow Flex Seal to fully cure before applying paint.

Typically, you should wait at least 24 hours for it to dry, but it's best to follow the manufacturer's recommendations for optimal curing times.

Q. Can I paint over Flex Seal in damp or wet conditions?

A: It's best to avoid painting over Flex Seal in damp or wet conditions, as moisture can interfere with the paint's adhesion and drying process. Make sure the surface is completely dry before painting.

Q. How many coats of paint should I apply over Flex Seal?

  A: The number of coats required depends on the paint type and color.

Generally, two coats of paint are sufficient for adequate coverage.

However, if you're using a lighter color over a dark Flex Seal base, you might need additional coats for proper coverage.

Q. Will painting over Flex Seal affect its sealing properties?

  A: No, painting over Flex Seal should not impact its sealing capabilities.

However, it's essential to ensure that the Flex Seal has cured properly before painting, as this could affect its performance.

Q. Can I use spray paint to paint over Flex Seal?

  A: Yes, spray paint can be used to paint over Flex Seal.

Ensure that the spray paint is compatible with Flex Seal and follow the manufacturer's instructions for application.

Q. How do I touch up paint over Flex Seal if it gets damaged?

  A: Touching up paint on Flex Seal is similar to touching up paint on other surfaces.

Clean the damaged area, lightly sand if necessary, and apply the paint in thin coats, allowing each coat to dry before applying the next one.


Painting over Flex Seal is possible, and by following these steps and using the right materials, you can achieve a professional and long-lasting finish.

Just remember to clean the surface, lightly sand the Flex Seal, use a compatible primer and paint, and apply a protective topcoat if desired.

Suggested Products:

  1. Acrylic-latex paint: This type of paint adheres well to Flex Seal products and provides a durable, weather-resistant finish. It is suitable for painting over most Flex Seal products, including the spray, liquid, and paste variants.
  2. Paint primer: A paint primer can help create a smooth, even surface for applying paint over Flex Seal products. It can enhance paint adhesion and may be required for certain types of paint or substrates.
  3. Paintbrushes or rollers: Quality paintbrushes and rollers are essential for applying paint over Flex Seal products evenly and without streaks or bubbles. Different brush or roller sizes may be required based on the area being painted and the type of Flex Seal product used.
  4. Painter's tape: Painter's tape can help protect surrounding surfaces and create clean, crisp lines when painting over Flex Seal products. It is especially useful when painting over Flex Tape or other Flex Seal products used in a repair.
  5. Sandpaper: Light sanding can help create a more even surface for painting over Flex Seal products, especially when dealing with rough or uneven textures. Use fine-grit sandpaper and be cautious not to damage the Flex Seal layer.

Helpful Resources 

Flex Seal FAQs - (

This page on the official Flex Seal website provides answers to frequently asked questions, including those related to painting over Flex Seal.

About the author 

Bob Thomas

A fully certified interior decorator and house painter , Bob Thomas brings immense expertise and knowledge amassed from many years of hands-on experience with residential, commercial and specialty painting and decorating projects of all sizes and scopes.

{"email":"Email address invalid","url":"Website address invalid","required":"Required field missing"}