How to Paint Wood Panelling: Step-by-Step Expert Guide

Painting wood panelling is one of those tasks that appears straightforward but is deceptively demanding. The multiple surfaces, recessed mouldings, and visible joints of panelling reveal every shortcut and every lapse in technique. A well-painted panel is a thing of quiet beauty — smooth, even, and crisply defined. A poorly painted one shows runs in the mouldings, brush marks across the fields, and visible sanding scratches that catch the light at the worst possible angle.

This guide walks you through the professional process we use to paint panelling in London homes, from initial assessment through to the final coat. Whether you are tackling the project yourself or simply want to understand what good professional work involves, this step-by-step approach will help you achieve the best possible result.

Step 1: Assess the Existing Condition

Before purchasing a single tin of paint, spend time examining the panelling closely.

For Previously Painted Panelling

Run your hand across the surface. Does the existing paint feel smooth and well-adhered, or can you feel ridges, bumps, and areas where the paint is lifting? Look closely at the moulding profiles — are they crisp and well-defined, or are they starting to lose their detail under accumulated paint layers?

Check for:

• Peeling or flaking paint — indicates adhesion failure, often caused by moisture or applying paint over a contaminated surface
• Cracking — can indicate paint that has become brittle with age, or movement in the timber beneath
• Runs and drips — evidence of previous poor application that will need to be removed
• Built-up paint in mouldings — years of repainting without stripping can fill and soften moulding profiles

For Bare or Stripped Panelling

If the panelling is bare wood — either new installation or stripped back to timber — assess the quality of the surface. Look for:

• Open grain that may need filling for a smooth finish
• Knots that will need sealing to prevent resin bleed-through
• Sap staining particularly in softwoods like pine
• Moisture content — timber should be below 16 percent moisture content before painting

For New MDF Panelling

MDF is now the most common material for new panelling installations in London properties. It provides a smooth, stable surface that paints well, but it has specific characteristics that affect preparation:

• Cut edges are more absorbent than faces and will show as a different texture if not sealed properly
• Dust from MDF cutting is fine and pervasive; all surfaces must be thoroughly cleaned before painting
• Swelling — MDF absorbs moisture readily, so it must be sealed on all faces and edges before any water-based product is applied

Step 2: Gather Materials and Equipment

Paints and Primers

For bare softwood panelling:

• Knotting solution (shellac-based) for sealing knots
• Quality wood primer (we recommend Zinsser BIN for problematic surfaces or a standard acrylic wood primer for clean timber)
• Undercoat matched to your topcoat colour
• Two tins of your chosen topcoat (eggshell or satinwood)

For bare MDF panelling:

• Specialist MDF primer (Zinsser BIN or a dedicated MDF sealer)
• Undercoat matched to your topcoat colour
• Two tins of your chosen topcoat

For previously painted panelling in good condition:

• Fine surface filler for small repairs
• Flexible caulk for joints
• Your chosen topcoat (two tins minimum)

Brushes

Invest in good-quality brushes. For panelling, you will need:

• A 63mm (2.5 inch) brush for flat panel fields
• A 38mm (1.5 inch) brush for rails and stiles
• A 25mm (1 inch) brush for moulding profiles
• A small artist's brush for cutting in tight corners

Synthetic filament brushes work well with water-based paints. For oil-based products, natural bristle brushes provide a superior finish.

Other Materials

• 120-grit and 240-grit sandpaper (or sanding sponges for mouldings)
• Tack cloths or a damp lint-free cloth for dust removal
• Low-tack masking tape
• Dust sheets
• Flexible decorator's caulk and a caulk gun
• Fine surface filler and filling knife
• Sugar soap or a specialist paint cleaner

Step 3: Prepare the Room

Clear furniture away from the panelled walls. If furniture cannot be moved, pull it to the centre of the room and cover with dust sheets. Lay dust sheets along the base of the panelling, taping them to the skirting board if necessary to prevent them from shifting.

Remove any fixtures attached to the panelling — light switches (after isolating the circuit), picture hooks, and any decorative hardware. Removing these items rather than painting around them produces a far superior result and actually saves time overall.

If the panelling is adjacent to flooring you need to protect, apply masking tape along the junction between the skirting and the floor.

Step 4: Clean All Surfaces

Previously Painted Surfaces

Wash the panelling with a sugar soap solution, working from bottom to top to prevent dirty drips running down and leaving marks on dry, unwashed surfaces below. Pay particular attention to areas around light switches, door handles, and anywhere that receives regular hand contact — these areas accumulate skin oils and grime that can prevent new paint from adhering.

Rinse with clean water and allow to dry thoroughly. In London properties where gas or coal fires were historically used, panelling may be contaminated with soot residue that requires more vigorous cleaning or the use of a specialist cleaner.

Bare Wood

Bare wood should be clean and dust-free. Vacuum the surface with a brush attachment to remove sanding dust, then wipe with a damp cloth. Allow to dry completely before priming.

MDF

Vacuum all surfaces thoroughly — MDF dust clings to everything. Wipe with a barely damp cloth (excessive moisture will cause MDF to swell) and allow to dry.

Step 5: Repair and Fill

Filling Nail Holes and Dents

Use a fine surface filler applied with a flexible filling knife. Overfill very slightly, as filler shrinks as it dries. For deep holes, apply filler in two stages, allowing the first application to dry before adding a second.

Caulking Joints

This step is frequently overlooked by amateur painters and is one of the biggest differences between professional and DIY results. Apply a thin bead of flexible decorator's caulk along every joint where the panelling meets the wall, where mouldings meet panel fields, and along any gaps between components.

Smooth the caulk with a damp finger, pressing it into the joint and removing excess. The goal is an invisible, sealed joint that will not crack as the timber moves seasonally. Work in sections of about 30 centimetres at a time — caulk skins over quickly, and trying to smooth a long bead after it has started to set produces a rough, messy finish.

Sanding

Once filler and caulk are dry (typically overnight for filler, a few hours for caulk), sand all surfaces.

• Previously painted surfaces in good condition: sand lightly with 240-grit paper to key the surface. The aim is to dull the sheen and create a surface that new paint can grip, not to remove existing paint.
• Filled areas: sand flush with surrounding surface using 120-grit, then smooth with 240-grit
• Bare wood: sand with 120-grit to remove any roughness, then 240-grit for a smooth finish
• MDF: sand lightly with 240-grit. MDF is already smooth, so heavy sanding is unnecessary and can damage the factory-sealed surface

For moulding profiles, use sanding sponges rather than flat sandpaper. Sponges conform to the curves of the moulding, sanding evenly without flattening the profile.

After sanding, remove all dust. Vacuum first, then wipe every surface with a tack cloth or barely damp lint-free cloth. Any dust left on the surface will be trapped under the next coat and will be visible forever.

Step 6: Prime

When Priming Is Necessary

Priming is essential for bare wood and MDF. For previously painted surfaces in good condition where you are applying the same type of paint (water-based over water-based, or oil-based over oil-based), priming is not usually necessary — the existing paint serves as the primer.

However, if you are switching from oil-based to water-based paint, an adhesion primer is recommended to ensure the new paint bonds to the old surface.

Applying Primer

Apply primer with the same systematic approach you will use for the topcoat (described in Step 8). Pay particular attention to MDF edges and end grain on timber, which are more absorbent and may need two coats of primer where faces need only one.

Allow primer to dry according to the manufacturer's instructions. Sand lightly with 240-grit paper between primer and undercoat or topcoat — this is called de-nibbing and removes any small imperfections or dust nibs in the primer coat.

Step 7: Apply Undercoat (Optional but Recommended)

An undercoat between primer and topcoat provides a uniform base colour that helps the topcoat achieve full opacity in fewer coats. This is particularly important when painting over a dark colour with a lighter one, or when using deeply pigmented topcoats that benefit from a tinted undercoat.

Tinting the undercoat to a shade close to your topcoat colour reduces the number of topcoats needed and improves colour depth in the finished result.

Step 8: Apply Topcoat — The Painting Sequence

This is where technique matters most. The order in which you paint the different elements of a panel determines whether you achieve a smooth, seamless finish or one marred by overlap marks and visible joins.

The Professional Sequence for Raised-and-Fielded Panels

1. Moulding profiles first. Using your small brush, paint all the moulding profiles — the shaped transitions between the raised frame and the flat field. Work paint into the angles and then smooth with light, even strokes following the line of the moulding.

2. Panel fields next. Using your 63mm brush, paint the flat central field of each panel. Apply paint in smooth, even strokes, finishing with light strokes in one direction (traditionally vertical for panel fields). Work quickly enough to maintain a wet edge — if one side of the field dries before you reach the other, you will get a visible lap mark.

3. Rails and stiles. Paint the horizontal rails and vertical stiles of the panel framework. Where rails meet stiles, the convention is that the horizontal rails take priority — finish the brush strokes on the rails horizontally and on the stiles vertically, cutting in neatly at the junctions.

4. Edges and margins. Finally, paint any exposed edges and the margins where the panelling meets the wall or ceiling.

The Professional Sequence for Flat Panels

1. Panel recesses and shadow gaps. Start with any recessed details or shadow gaps around the panel edges.
2. Flat panel faces. Paint the large flat areas with smooth, even strokes.
3. Frame members. Paint the surrounding frame.
4. Edges and junctions. Finish with edges and junctions.

Avoiding Common Mistakes

Overloading the brush. Dip only one-third of the bristle length into the paint and tap off excess on the side of the tin. An overloaded brush deposits too much paint in moulding recesses, causing runs and drips.

Working too slowly. Modern water-based paints dry quickly. If you work too slowly, the paint starts to set before you can smooth it, leaving visible brush marks and lap marks. Work steadily and methodically, completing each panel fully before moving to the next.

Checking at the wrong angle. After painting each section, crouch down and sight along the surface at a low angle with the light behind you. This reveals any runs, drips, or thin areas that are invisible when viewed straight on. Catch and correct these immediately while the paint is still wet.

Step 9: Sand Between Coats

After the first topcoat is fully dry (consult the manufacturer's instructions — typically four to six hours for water-based eggshell), sand the entire surface very lightly with 240-grit paper. This de-nibbing step removes any dust particles, tiny brush marks, or raised grain, providing a perfectly smooth surface for the final coat.

Remove all sanding dust with a tack cloth before applying the second coat.

Step 10: Apply Final Topcoat

The final coat is applied using exactly the same technique as the first. Take extra care with this coat — it is the one that will be seen and judged for years to come.

Ensure good lighting while you work. Position a work light so that it casts raking light across the surface you are painting, revealing any imperfections in real time. Natural daylight from a window is ideal.

Apply paint in thin, even coats. It is better to apply two thin topcoats than one thick one. Thick coats sag, run, and take longer to dry, while thin coats level out smoothly and dry quickly to a uniform finish.

Step 11: Final Inspection and Touch-Up

Once the final coat is fully dry, conduct a thorough inspection in daylight. Walk slowly along the panelling, checking at various angles. Common issues to look for include:

• Runs or drips in moulding recesses
• Thin areas where the undercoat shows through
• Brush marks on large flat surfaces
• Caulk joints that have cracked or shrunk
• Filled areas that have sunk and become visible

Minor issues can be addressed with spot touch-ups. More significant problems may require sanding back and applying a local additional coat.

Drying and Curing

Water-based eggshell paints are typically touch dry within a few hours but do not reach full hardness for two to four weeks. During this curing period, treat the painted panelling gently:

• Avoid leaning objects against it
• Do not attempt to clean it
• Keep the room at a moderate temperature with reasonable ventilation
• Avoid hanging pictures or reattaching fixtures for at least a week

After full curing, your painted panelling should provide years of beautiful service before it needs attention again. A quality paint properly applied to well-prepared panelling in a London home can easily last seven to ten years before repainting is needed.

When to Call a Professional

Painting panelling is achievable as a DIY project, but it demands patience, the right tools, and a willingness to invest time in preparation. If your panelling is original period work of significant architectural value, if the project involves multiple rooms, or if you want a flawless finish on high-visibility panelling in reception rooms, professional application will almost certainly deliver a superior result.

At Mayfair Painters and Decorators, panelling painting is one of our specialities. Our team has the experience, the technique, and the eye for detail that fine panelling work demands. We work across London, from grand Georgian townhouses in Mayfair to contemporary apartments in Battersea, and we bring the same meticulous approach to every project.