How to Paint Interior Brick for a Lasting Finish

A bare brick chimney breast can make a room feel characterful, but it can also absorb light, shed dust and dominate a scheme that needs a cleaner finish. Knowing how to paint interior brick properly makes the difference between a crisp, durable wall and a patchy surface with peeling paint in the joints.

Brick is not a smooth plastered wall. It is porous, uneven and often contaminated with soot, grease, old wax, dust or salts. Preparation and primer do most of the hard work, while the final paint choice determines how washable, matt or hard-wearing the surface will be.

Check whether the brick is ready for paint

Start by looking closely at the brickwork in good natural light. Sound, dry brick can usually be painted successfully. Do not paint over active damp, crumbling mortar, loose brick faces or white powdery deposits. These problems need resolving first, otherwise moisture or salts can force a new coating away from the wall.

White marks are often efflorescence, where salts move through masonry as moisture evaporates. Brush the deposits away with a dry, stiff brush, then identify the source of moisture before decorating. A wall that is cold but dry may simply need a breathable coating system. A wall that is wet after rain, however, may have an exterior pointing, guttering or damp-proofing issue to address.

For a working fireplace, only paint the surrounding brickwork once it is fully cool, clean and structurally sound. The inside of a firebox needs a specialist high-temperature coating, not ordinary interior wall paint. Keep standard paint away from surfaces directly exposed to flames and intense heat.

If the brick has previously been sealed, varnished or painted with a glossy coating, test adhesion before committing to the whole project. Sand a small area, apply the chosen primer and leave it to cure. If it scratches or pulls away easily, more preparation or a different primer is needed.

Tools and materials for painting interior brick

Brickwork needs enough product to coat its face and fill its recessed mortar joints. A long-pile roller speeds up large areas, while a good brush is essential around edges and for working paint into the texture.

For most projects, prepare the following:

• Dust sheets, masking tape, gloves and safety glasses
• A vacuum with brush attachment, stiff nylon brush and sugar soap or suitable degreaser
• Filler or repair mortar for small, stable cracks and damaged joints
• Masonry or stain-blocking primer, selected for the condition of the wall
• Interior acrylic paint in the required sheen, plus a long-pile roller, roller tray and quality cutting-in brush

Choose paint according to the room as well as the look. A breathable matt finish suits a dry living room and keeps the natural texture of brick visually soft. Satin offers greater wipeability in a hall, kitchen or utility room, but its slight sheen will make uneven brick and mortar more noticeable. In bathrooms or kitchens, use a durable interior acrylic coating designed for humid or washable areas once the correct primer is in place.

Clean brick thoroughly before priming

Move furniture back, protect the floor and remove as much surface dust as possible with a vacuum and brush attachment. Dry brushing alone can push soot and dust deeper into the mortar, so vacuum first and then brush stubborn debris from the joints.

Wash ordinary dirt using a diluted sugar soap solution or a suitable degreasing cleaner. Use a sponge rather than soaking the wall. Brick absorbs water readily, and excess moisture extends drying times. Rinse with clean water where the cleaner instructions require it, then allow the wall to dry fully. Depending on room temperature, ventilation and the depth of the brick, this may take 24 to 48 hours.

Soot needs extra care. Brush it away gently, avoid rubbing it into the brick, then apply a stain-blocking primer. Ordinary acrylic primer may not stop soot or tannin-like stains from bleeding through a pale topcoat. This is one area where using the cheaper general-purpose product can create more work later.

Repair joints and mask the edges

Rake out only loose mortar and remove flaking old paint with a scraper or stiff brush. Fill small cracks and shallow holes with a suitable repair filler or interior mortar repair product, following its drying guidance. Repairs should be firm, dry and level with the surrounding texture rather than polished smooth.

Mask skirting boards, adjacent plaster, timber trim, sockets and switches. Remove socket and switch covers only after isolating the power supply if you are competent to do so. Otherwise, mask carefully around them and do not allow paint to enter fittings.

Protect nearby surfaces well. A roller will throw small specks when it passes over rough brick, particularly on the first coat. Cover floors beyond the immediate working area, not just the narrow strip at the base of the wall.

How to paint interior brick with primer

Primer is not optional on bare brick. It controls suction, improves adhesion and prevents the finish coat disappearing into the masonry in uneven patches. Select a masonry-compatible or multi-surface primer for clean, dry bare brick. Choose a stain-blocking primer where soot, water marks or persistent discolouration are present.

Cut in around the perimeter with a brush, pressing primer into mortar joints without flooding them. Then use a long-pile roller to cover the main area. Work in manageable sections from top to bottom, loading the roller generously but not so heavily that primer runs down the face of the bricks.

After rolling a section, use the brush to reach any missed joints, deep holes and irregular edges. This is called back-brushing, and it prevents the familiar problem of apparently painted brick that reveals dark uncoated mortar lines when viewed from the side.

Allow the primer to dry for the period stated on the tin. Do not rush a second coat of primer unless the brick is exceptionally porous, the surface remains visibly uneven in absorption, or the product specification calls for it. One properly applied coat is often enough, but very dry reclaimed brick may require two.

Apply two controlled topcoats

Stir the paint thoroughly, including material from the bottom of the tin. Do not thin it unless the manufacturer specifically allows it. Thinning may make application feel easier on rough brick, but it can reduce coverage and leave the mortar joints underprotected.

Paint the edges first, then roll the field of the wall in sections. Work the roller in different directions to reach uneven surfaces, finishing each section with light strokes in one direction. Keep a wet edge so overlap marks do not dry between sections.

Expect the first coat to look inconsistent. Brick’s texture creates shadow, and the initial coat often exposes small missed areas after it dries. Once the stated recoating time has passed, inspect the wall from several angles and use a brush to touch in recesses before applying the second coat.

Two coats are normally the right specification for a solid, even interior finish. A third may be worthwhile over very dark brick when changing to white, cream or another pale colour. It is better to apply three thin, fully dried coats than one heavy coat that bridges detail, drips in joints or stays soft beneath the surface.

Choose the finish with the room in mind

White and warm off-white paints brighten brick while retaining the relief of each brick face. Soft greys, clay neutrals and muted greens can make a fireplace wall feel more integrated with a period or modern interior. A deep colour creates impact, but it also emphasises texture and can make a small room feel narrower if used across every wall.

Matt paint is the usual choice for decorative interior brick because it hides minor irregularities and gives a calm, contemporary result. For high-contact areas, a washable matt or satin acrylic finish is more practical. Satin reflects more light, so it is easier to wipe down but less forgiving on rough mortar and uneven repairs.

Avoid using a dense, non-breathable coating on old brickwork that needs to release small amounts of moisture vapour. In older properties, particularly where walls are solid rather than cavity construction, matching the coating to the wall’s condition matters more than choosing the highest sheen or quickest-drying option.

Let the coating cure before putting the room back together

Paint may feel dry within hours, but it takes longer to harden fully. Keep the room ventilated, avoid pressing furniture against the wall and wait before cleaning the surface. Follow the product’s stated cure time, especially with washable interior acrylic paints.

For future maintenance, vacuum dust from textured brick with a soft brush attachment and wipe only when necessary using a lightly damp cloth. Aggressive scrubbing can polish matt finishes or catch on raised brick edges. Keep a small, clearly labelled amount of leftover paint for touch-ups, as colour and sheen can vary between batches.

A carefully primed brick wall is a practical upgrade, not just a cosmetic one. Take time to solve moisture and staining before opening the paint tin, then choose a finish that suits how the room is actually used. The result should look deliberate from every angle and stay that way through everyday life.