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

How to seal an exposed internal brick or masonry wall

So, what is the best way to seal & dustproof exposed internal brick and masonry walls?

How do you seal an interior exposed brick & masonry wall?

If you wish to seal and dustproof internal brick walls or natural stone walls, we recommend using Floorseal Interior Brick Sealer & Dustproofer.

Floorseal Interior Brick Sealer & Dustproofer is suitable for sealing old brickwork, new brickwork and masonry. This may be sandblasted surfaces or any soft, friable surface which would benefit from sealing & dustproofing.

How does Interior Brick Sealer & Dustproofer work?

Apply the brick sealer to any porous surface and allow the sealer to be absorbed. You will notice the sealer soaking into the pores of the brick or stone. A small amount of product will also dry on the surface thus binding the surface and preventing dust.

The product resists staining as well as preventing unwelcome dusting. Interior Brick Sealer & Dustproofer is both a sealer and a dustproofer.

One single application is normally sufficient to seal the surface.

When sealing particularly porous surfaces you may wish to apply the sealer twice. Sandblasted brick & masonry is extremely porous and may benefit from an additional application.

How do you seal an interior brick wall?

What should I use to seal an interior brick wall?

Interior Brick Sealer & Dustproofer is an easy & effective way of sealing internal brick walls. It is water-based, so low odour; this is an important consideration when applying a sealer in an interior space.

The sealer is non-flammable, therefore suitable for use adjacent to fireplaces or multi-fuel burning stoves.

Interior Brick Sealer & Dustproofer is easy to apply with a brush, sponge or microfibre cloth.

For large areas, the sealer can be applied with a low-pressure sprayer, fitted with a coarse nozzle. When spraying, take care to remove runoff by distributing excess sealer with a brush or roller.

Any obvious excess sealer can be blotted from the surface with cloths or a dry roller. This may occasionally collect in areas where the pointing is recessed or on the surface of a particularly rough stone.

Do you need to seal interior brick walls?

Sealing surfaces to prevent airborne dusting is important in commercial environments. It prevents dust from travelling through air conditioning systems contaminating electrical systems and the general working environment.

Soft historic brickwork typically sheds dust when a building dries during or after renovation. Sometimes this occurs slowly as the ambient temperature within the building increases. Dustproofing these soft friable surfaces stabilises surfaces preventing airborne particles.

It is beneficial to seal any internal brick and masonry surface to prevent dusting and prevent staining. It is also possible to slightly enhance the colour of some natural stone or soft brickwork.

What kind of finish does Floorseal Interior Brick Sealer & Dustproofer produce?

Interior Brick Sealer & Dustproofer dries to a matt finish when applied in one coat. It may also slightly deepen surface colours, enhancing natural earthy tones, veining & shading.

Colour enhancement is most obvious when the sealer is applied to soft & highly porous clay-based red brick. The sealer also colour enhances shading and veining in sandstones.

When sealing any surface we recommend testing the sealer on a small area to check for suitability. Brickwork & masonry can react differently to any type of sealer, apply to a small out of sight area first and allow the sealer to dry.

One coat of sealer will produce a matt finish, in most situations the appearance of the brickwork will remain unaltered. If you want to enhance the appearance further, you may wish to build up in further coats to try to obtain a sheen, or perhaps to seal a floor.

When sealing floors we recommend sealing the floor with 2-3 coats.

Is it possible to create a sheen instead of a matt finish?

If Interior Brick Sealer & Dustproofer is applied in multiple coats a subtle satin sheen can be seen. Applying the product with a microfibre cloth ensures a nice even finish.

Applying any additional coats in thin even coats (with microfibre cloths) helps to preserve a more natural finish. This also helps to prevent the potential for overbuilding the product.

How do you seal an interior exposed brick or masonry wall?

Do you have an internal brick and masonry sealer that will not change the appearance of the surface?

Yes, you could use Floorseal Breathable Brick Sealer & Waterproofer on interior brick, exterior brick and on masonry. It is a sealer which resists water and oil-based staining and is also breathable. This sealer can be used on both walls and floors.

Please note that Floorseal Breathable Brick Sealer & Waterproofer does not dustproof as it is a full impregnating sealer. This sealer is totally embedded into the pores of the treated material; it does not dry on the surface, so will not dustproof.

Floorseal Breathable Brick Sealer & Waterproofer resists water and oil-based staining. If preventing staining from liquid splashes are your only concern (not dustproofing) it is appropriate for this purpose.

If dustproofing, possibly deepening colour or creating a sheen is required you should use Interior Brick Sealer & Dustproofer. The primary purpose of Interior Brick Sealer & Dustproofer is to prevent dusting leaving a matt finish. It will only achieve a satin finish if you build the product up in thin coats.

Coverage Rates for sealing internal masonry and brick

The coverage rate of Interior Brick Sealer & Dustproofer is approximately 8m2 per litre – when applied in a single application. You may achieve a greater coverage rate on dense bricks or dense masonry. The coverage rate will increase to approximately 16m2 per litre when applying the 2nd coat (if required). Very porous bricks may require more product.

The coverage rate of Floorseal Breathable Brick Sealer & Waterproofer is approximately 5m2 per litre, you may wish to lightly reapply the product on more porous surfaces.

Sandblasted surfaces

Please note on highly porous surfaces like sandblasted brick or stone the surface will absorb generous quantities of any kind of sealer.

We recommend pre-cleaning all surfaces by at least brushing and dry vacuuming prior to sealing. Sandblasted surfaces will certainly require vacuuming before any sealing is carried out.

In conclusion

Floorseal Interior Brick Sealer & Dustproofer can be used to seal and dustproof internal walls. It dries to a matt finish & dustproofs the surface in one coat. It can be built to a sheen when applied in additional coats – typically 3. This sealer can be used to seal floors when applied in 3 coats. The sealer may slightly enhance colour in certain bricks, although this is not common – check before use if unsure. Not to be used in wet rooms. Internal use only and overpaintable with a quality paint.

Floorseal Breathable Brick Sealer & Waterproofer is often used on the external walls of buildings but can be used within buildings to simply waterproof. Great for use in wet areas where dustproofers cannot be used. Please note that this product will not dustproof as it seals from within the pores of the brick. Can be used to seal external walls against rainwater penetration. Do not overpaint.

Further information

Please Click Here to view our products & accessories for cleaning and sealing bricks, natural stone or general masonry. This includes all our handy ‘how to’ guides for sealing and cleaning interior and exterior brick, stone or masonry.

The information contained within this article is not exhaustive. If you need further information please contact Floorseal on (01484) 861461 or email us our web address is