what to use to seal interior brick wall

Best Sealants for Interior Brick Walls: A Comprehensive Guide

By Andrew MartinezMay 2, 2026

Brick walls add a unique charm and character to your interior, but they can also be porous and absorb moisture, leading to issues like mold and mildew. Sealing your interior brick wall is crucial to maintain its longevity and prevent these problems. But with numerous sealers available, choosing the right one can be overwhelming. Let's delve into the best options for sealing interior brick walls.

Before we dive into the types of sealers, it's essential to understand that not all bricks are the same. Some are more porous than others, and the type of brick will influence the choice of sealer. Additionally, consider the room's humidity levels and the wall's exposure to moisture. Now, let's explore the main types of sealers and their sub-categories.

Penetrating Sealers

Penetrating sealers are the most common and recommended for interior brick walls. They soak into the brick, forming a protective barrier against moisture and stains without changing the wall's appearance.

How to seal & dustproof an exposed internal brick or masonry wall

How to Clean and Seal Interior Brick in 4 Easy Steps!

Penetrating sealers are further categorized into two types:

Silane-Based Sealers

Silane-based sealers are synthetic, water-based, and eco-friendly. They provide excellent water repellency and are ideal for high-humidity areas like bathrooms and kitchens. They also allow the brick to breathe, preventing trapped moisture from causing damage.

How to seal and protect your brick or stone walls

Keep Your Indoor Brick Walls Clean With These Tips

Examples of silane-based sealers include: Concrobium Mold Control and Tec-Spray Silane.

Siloxane-Based Sealers

Siloxane-based sealers are also synthetic but are solvent-based. They offer superior water repellency and are suitable for walls exposed to moisture. However, they have a stronger odor and take longer to dry than silane-based sealers.

Examples of siloxane-based sealers include: Bond-A-Flex Siloxane and RedGard Waterproofing Paint.

a man is painting the side of a house with paint rollers and a bucket

Brick Sealant: How To Keep Your Bricks Looking Good – The Paver Sealer Store

Sealing exposed brick interior wall? - Ceramic Tile Advice Forums

Interior Brick and Dust Sealer by Kingfisher

Film-Forming Sealers

Film-forming sealers create a protective layer on the surface of the brick. They are effective in preventing moisture and stains but can trap moisture inside the brick, leading to potential damage. They are also more challenging to apply and maintain than penetrating sealers.

Film-forming sealers can be further categorized into:

Acrylic Sealers

Acrylic sealers are water-based and provide a clear, durable finish. They are easy to apply but offer less protection against moisture than other sealers. They are best suited for low-humidity areas and as a top coat over other sealers.

the words best brick sealer we tested & compared wall sealers on a beige background

Sealing Leaks in a Historic Brick Wall with Spetec AG200

How to: Seal Whitewashed Brick | Victorian In Bloom

a woman standing on a ladder painting a brick wall with white paint and an electric heater

THE BEST DIY Faux Brick Wall Tutorial! High End Custom Look for a Fraction of Thin Brick! So Easy!

a man with a mop is cleaning the side of a brick building

four different types of brick sealer are shown in this image, and there is also instructions for how to use it

a brick wall with the words faux brick wall tutorial written on it in black

What They Don’t Tell You About Exposing Hidden Brick

How to Expose & Clean a 100-Year-Old Brick Wall

Examples of acrylic sealers include: Zinsser Bulls Eye 1-2-3 and KILZ Premium.

Epoxy Sealers

Epoxy sealers are solvent-based and provide excellent protection against moisture and chemicals. They are ideal for high-traffic areas and can be used in both residential and commercial settings. However, they have a strong odor, take longer to dry, and can yellow over time if exposed to sunlight.

Examples of epoxy sealers include: EpoxyShield and TotalBoat Epoxy.

When sealing your interior brick wall, always remember to prepare the surface by cleaning it thoroughly and allowing it to dry completely. Test the sealer on a small, hidden area first to ensure it doesn't alter the brick's appearance or cause any adverse reactions. Always follow the manufacturer's instructions for the best results.

In the end, choosing the right sealer depends on your specific needs, the type of brick, and the room's conditions. Consulting with a professional or a specialist in brick restoration can also provide valuable insights tailored to your situation. So, don't let moisture and stains dampen your brick wall's charm – seal it right and enjoy its beauty for years to come!