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Expert solutions for cracks, damp, and unstable surfaces.

Find Your Masonry Preparation Guide

Exterior walls face the harshest conditions. Whether you are dealing with penetrating damp in brickwork, 'blown' render patches, or a chalky surface that needs stabilising, the right preparation is the difference between a 10-year finish and a failure. Search below to find the specific repair method for your building.

Professional restoration of weathered cast stone headers using masonry paint and deep cleaning techniques.

Reviving Cast Stone Headers & Sills: Cleaning & Painting Guide

You have freshly painted your front door. You have cleaned the windows. But the house still looks tired. The culprit is usually the Architectural Details: the window sills, the headers (lintels) above the doors, and the quoins on the corners....

Lees meer

Close-up of porous red brickwork being prepared for a breathable moisture treatment instead of a non-breathable sealer.

Breathable Protection: Why You Must Never Seal Damp Walls (With the Wrong Product)

You have a damp patch on your interior wall. Or maybe your exterior brickwork looks permanently wet and mossy. Your instinct is to go to the hardware store, buy a tin of "Heavy Duty Waterproof Sealer" (usually a thick, clear...

Lees meer

Applying invisible clear water repellent to interior brickwork to prevent penetrating moisture.

Stopping Penetrating Damp: Clear Water Repellents Explained

You have damp patches on your internal walls. They aren't near the floor (Rising Damp), and they aren't near the ceiling (Leaking Roof). They are floating in the middle of the wall, usually appearing darker after heavy rain. This is...

Lees meer

A pristine, freshly painted anthracite gray engineering block wall showing a flawless finish.

How to Properly Prime Engineering Blocks for Painting, Low-Suction Surfaces

You are painting the exterior of a property. You roll the masonry paint onto the main red brick walls, and it sticks perfectly. Then you get to the "DPC" (Damp Proof Course) - those bottom three rows of dark, shiny...

Lees meer

A close-up of a textured Tyrolean wall showing a stark contrast between a dirty section and a freshly cleaned section.

Safe Cleaning Methods for Fragile Render

You look at your house walls. They are covered in green algae, red streaks, or black lichen spots. The wall has a rough, popcorn-like texture (Tyrolean) or a fine, sandy finish (Stucco). Your first instinct is to get the pressure...

Lees meer

The best way to prime common exterior bricks before applying masonry paint to prevent peeling.

Priming Common Bricks for Adhesion

You see them everywhere - on garden walls, garages, and the sides of millions of UK homes. From smooth, dense engineering bricks to rough, textured facing bricks, they were built for durability, not necessarily for modern aesthetics. Naturally, many homeowners...

Lees meer

Repairing deep defects in UK exterior render using a professional-grade filler and a stainless steel knife.

Filling Deep Defects: Mortar Repair vs. Exterior Polyfilla

You have removed an old satellite dish, an outside light, or a rusty pipe bracket. You are left with a jagged, ugly hole in your masonry. It’s about the size of a golf ball - maybe bigger. You head to...

Lees meer

Repairing a section of blown render on a UK house by applying a fresh mortar patch over exposed brickwork.

Repairing Blown Render: Patching Holes Before You Paint

You are inspecting your exterior walls before painting. You see a hairline crack. You press on it, and the wall moves slightly. Or perhaps you tap it with your knuckles, and instead of a solid "thud," you hear a hollow,...

Lees meer

Applying a professional primer to porous exterior render to prevent paint suction and patchiness.

Priming Porous Render: How to Stop Suction & Patchy Paint

You have just finished rendering a wall, or perhaps you are painting a bare pebble dash for the first time. You apply your first coat of expensive masonry paint. It looks great while wet. But as it dries, it turns...

Lees meer

Performing a simple tape test on a concrete floor to check for loose dust and debris before painting.

The Tape Test: Diagnosing Unstable Masonry Before Painting

You have cleaned the wall. It looks clean. You apply the paint. It goes on beautifully. Three months later, you walk into the room (or look at the exterior of your house) and see the paint bubbling, cracking, or peeling off...

Lees meer

Applying a clear stabilising primer to a chalky rendered exterior wall on a UK house.

Stabilising Primers: How to Fix Chalky and Dusty Masonry

You are ready to paint the exterior of your house. You have bought the expensive masonry paint. You have the ladder ready. But when you run your hand across the wall, your palm comes away covered in white dust. Or...

Lees meer

Applying flexible grey filler to a hairline crack in a UK red-brick exterior wall.

Treating Hairline Cracks: Why You Need Flexible Exterior Fillers for Damaged Masonry

You spot a thin, spider-web crack running down your rendered wall. It looks minor. You grab a tub of standard powder filler or a bit of leftover cement, smear it over the crack, sand it down, and paint it. It...

Lees meer

Comparing traditional mortar pointing and modern brush-in jointing compounds on a UK sandstone patio.

Repointing Patio Joints: Mortar vs. Brush-In Compounds

Look at your patio. The slabs are likely fine, but the stuff in between them - the pointing - is cracked, missing, or full of weeds. It ruins the look of the entire garden. You know you need to fix...

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Fixing Chalky, Dusty & Friable Walls

Stabilising & Priming

The #1 cause of masonry paint failure is applying it to a "dusty" surface. This section covers Stabilising Solutions—the deep-penetrating primers that bind loose render and chalky paint to create a solid base for the topcoat.

Applying a professional primer to porous exterior render to prevent paint suction and patchiness.

Priming Porous Render: How to Stop Suction & Patchy Paint

You have just finished rendering a wall, or perhaps you are painting a bare pebble dash for the first time. You apply your first coat of expensive masonry paint. It looks great while wet. But as it dries, it turns...

Lees meer

Performing a simple tape test on a concrete floor to check for loose dust and debris before painting.

The Tape Test: Diagnosing Unstable Masonry Before Painting

You have cleaned the wall. It looks clean. You apply the paint. It goes on beautifully. Three months later, you walk into the room (or look at the exterior of your house) and see the paint bubbling, cracking, or peeling off...

Lees meer

Applying a clear stabilising primer to a chalky rendered exterior wall on a UK house.

Stabilising Primers: How to Fix Chalky and Dusty Masonry

You are ready to paint the exterior of your house. You have bought the expensive masonry paint. You have the ladder ready. But when you run your hand across the wall, your palm comes away covered in white dust. Or...

Lees meer

Filling Cracks, Holes & Blown Render

Masonry Repairs

Never paint over a crack. This section guides you through opening up hairline cracks (the V-Cut method), choosing the right flexible exterior fillers, and patching "blown" or hollow render before you pick up a brush.

Repairing deep defects in UK exterior render using a professional-grade filler and a stainless steel knife.

Filling Deep Defects: Mortar Repair vs. Exterior Polyfilla

You have removed an old satellite dish, an outside light, or a rusty pipe bracket. You are left with a jagged, ugly hole in your masonry. It’s about the size of a golf ball - maybe bigger. You head to...

Lees meer

Repairing a section of blown render on a UK house by applying a fresh mortar patch over exposed brickwork.

Repairing Blown Render: Patching Holes Before You Paint

You are inspecting your exterior walls before painting. You see a hairline crack. You press on it, and the wall moves slightly. Or perhaps you tap it with your knuckles, and instead of a solid "thud," you hear a hollow,...

Lees meer

Applying flexible grey filler to a hairline crack in a UK red-brick exterior wall.

Treating Hairline Cracks: Why You Need Flexible Exterior Fillers for Damaged Masonry

You spot a thin, spider-web crack running down your rendered wall. It looks minor. You grab a tub of standard powder filler or a bit of leftover cement, smear it over the crack, sand it down, and paint it. It...

Lees meer

Clear Sealers & Water Repellents

Waterproofing & Damp Preparation

Not everyone wants a coloured paint. Learn how to use Silane/Siloxane impregnators to waterproof brick and stone without changing their appearance. Essential prep for preventing penetrating damp.

Close-up of porous red brickwork being prepared for a breathable moisture treatment instead of a non-breathable sealer.

Breathable Protection: Why You Must Never Seal Damp Walls (With the Wrong Product)

You have a damp patch on your interior wall. Or maybe your exterior brickwork looks permanently wet and mossy. Your instinct is to go to the hardware store, buy a tin of "Heavy Duty Waterproof Sealer" (usually a thick, clear...

Lees meer

Applying invisible clear water repellent to interior brickwork to prevent penetrating moisture.

Stopping Penetrating Damp: Clear Water Repellents Explained

You have damp patches on your internal walls. They aren't near the floor (Rising Damp), and they aren't near the ceiling (Leaking Roof). They are floating in the middle of the wall, usually appearing darker after heavy rain. This is...

Lees meer

Pebbledash, Tyrolean & Roughcast

Substrate Specific Preparation

Painting smooth render is easy; painting jagged pebbledash is a challenge. This section covers "Bagging" (slurry coating) to smooth out walls, and specific prep techniques for heavily textured surfaces.

Professional restoration of weathered cast stone headers using masonry paint and deep cleaning techniques.

Reviving Cast Stone Headers & Sills: Cleaning & Painting Guide

You have freshly painted your front door. You have cleaned the windows. But the house still looks tired. The culprit is usually the Architectural Details: the window sills, the headers (lintels) above the doors, and the quoins on the corners....

Lees meer

A pristine, freshly painted anthracite gray engineering block wall showing a flawless finish.

How to Properly Prime Engineering Blocks for Painting, Low-Suction Surfaces

You are painting the exterior of a property. You roll the masonry paint onto the main red brick walls, and it sticks perfectly. Then you get to the "DPC" (Damp Proof Course) - those bottom three rows of dark, shiny...

Lees meer

A close-up of a textured Tyrolean wall showing a stark contrast between a dirty section and a freshly cleaned section.

Safe Cleaning Methods for Fragile Render

You look at your house walls. They are covered in green algae, red streaks, or black lichen spots. The wall has a rough, popcorn-like texture (Tyrolean) or a fine, sandy finish (Stucco). Your first instinct is to get the pressure...

Lees meer

The best way to prime common exterior bricks before applying masonry paint to prevent peeling.

Priming Common Bricks for Adhesion

You see them everywhere - on garden walls, garages, and the sides of millions of UK homes. From smooth, dense engineering bricks to rough, textured facing bricks, they were built for durability, not necessarily for modern aesthetics. Naturally, many homeowners...

Lees meer

Expert answers on stabilising, repairing, and waterproofing exterior walls.

Masonry Preparation FAQs

Stabilising (Chalky & Dusty Walls)

The number one reason masonry paint peels is a "friable" surface. As old paint ages, the binder breaks down, leaving a powdery residue. If you paint directly over this chalky layer, the new paint sticks to the dust, not the wall, and will eventually fall off.

How do I know if my wall needs a Stabilising Primer?

Perform the "Thumb Test." Rub your palm or thumb firmly across the existing painted surface. If your hand comes away white or powdery, the surface is "chalking." You must wash it down and apply a Stabilising Solution to bind the loose particles before painting.

Should I use Water-Based or Solvent-Based Stabiliser?

This depends on the severity of the problem.

  • Solvent-Based (High Performance): Required for very chalky, old, or highly porous surfaces. The solvent particles are smaller and penetrate deeper to lock the surface together.
  • Water-Based (Eco-Friendly): Suitable for slightly dusty surfaces or newer render that just needs a light seal.
Can I just dilute my masonry paint instead of buying a primer?

On bare, sound render, a "mist coat" (diluted paint) is often fine. However, on chalky or flaking surfaces, diluted paint is not enough. You need the specific binding resins found in a Stabilising Solution to glue the surface back together.

Repairs (Cracks & Blown Render)

Exterior walls move with thermal expansion and contraction. Rigid fillers (like standard cement) often crack and fall out because they cannot handle this movement. Successful masonry repair requires flexible materials that move with the building.

Can I just paint over hairline cracks?

No. Paint is a thin coating, not a filler. Even if the paint bridges the crack initially, it will snap open as soon as the weather changes. You should fill hairline cracks with a flexible exterior acrylic filler or use a "High Build" reinforced coating designed to bridge small fissures.

What is "Blown" render and how do I find it?

"Blown" render means the render has detached from the brickwork behind it, leaving a hollow air pocket. You can find it by tapping the wall with a hammer handle; it will sound hollow compared to the solid "thud" of good render. These areas must be hacked off and patched, or they will eventually fall off.

Should I use silicone sealant for cracks?

Never use standard silicone sealant on areas you intend to paint. Paint will not stick to silicone (it repels it), leaving you with an ugly unpainted stripe. Always use a "Paintable" external filler or polyurethane sealant.

Waterproofing & Damp

Penetrating damp occurs when rain soaks through the pores of the brick or stone. Clear water repellents (impregnators) are the best way to stop this without changing the look of your home.

Will a Water Seal change the colour of my brickwork?

A high-quality Silane/Siloxane impregnator should dry clear and invisible (matte). It soaks into the brick rather than sitting on top like a varnish. However, cheaper "varnish-style" sealers can leave a "wet look" or sheen, so always check the label or do a patch test.

Can I paint over a Water Repellent later?

Generally, no. Water repellents are designed to repel liquids—including liquid paint. If you seal your wall now, you may not be able to paint it for 5-10 years until the sealer wears off. Decide if you want a natural look (Clear Sealer) or a coloured look (Masonry Paint) before you start.

What is the difference between Rising Damp and Penetrating Damp?

Rising Damp comes from the ground up (usually stopping at 1 meter high) due to a failed damp proof course. Penetrating Damp can happen anywhere on the wall (even high up) and is caused by rain soaking through porous brick or cracks. Our sealers are designed to stop Penetrating Damp.

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The Help & Technical Hub

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