Woodwork is the detail that frames a room. Crisp skirting, clean door frames and a smooth staircase make the whole space look finished, while chipped, yellowed or drippy trim drags everything down, however good the walls are. It is also the part of a decorating job most people rush, which is exactly why it so often goes wrong.

This guide walks through how we approach woodwork at Alan Cox Decorators, from preparation through to the final coat. The principles are the same whether you are tackling a single skirting board yourself or planning a whole-house refresh.

Why woodwork needs a different approach to walls

Walls take emulsion, which is forgiving. Woodwork is a harder, less porous surface that takes knocks, scuffs and cleaning, so it needs a tougher coating and far more careful preparation. Skip the prep and the paint will not bond properly, which is what causes the flaking, chipping and peeling you see on neglected trim.

There is also an order to the job. When you are decorating a full room, paint the woodwork in the same sequence professionals use, so nothing you do later spoils work you have already finished.

Step 1: Clear the space and protect surfaces

Move furniture away from the walls so you can reach the full run of skirting, and lift or roll back carpet edges where you can. Lay dust sheets along the floor to catch both sanding dust and drips.

Use low-tack painter’s tape where the skirting meets the floor and, if you prefer taped lines, where it meets the wall. Press the edge down firmly so paint cannot bleed underneath, and lift the tape while the paint is still slightly soft rather than waiting until it has fully hardened, which can tear the new film.

Step 2: Clean thoroughly

Woodwork collects grease, dust and general grime, and paint will not stick to a dirty surface. Wash skirting and trim down with sugar soap, paying particular attention to kitchen woodwork, which often carries a film of cooking grease that quietly stops paint adhering. Rinse with clean water and let everything dry completely before going further.

Step 3: Sand for adhesion

Sanding does two jobs: it smooths the surface and it keys it, giving the new paint something to grip. On previously painted woodwork in sound condition, a light rub-down with a medium-fine paper is usually enough to dull the existing sheen. Bare or patchy wood needs a fuller sand, working with the grain, not across it.

Once sanded, wipe everything down with a slightly damp cloth or a tack cloth to lift every trace of dust. Any dust left behind gets sealed into the paint and you will feel it, and see it, in the finished surface. A quick slide of the hand along the wood tells you whether it is genuinely clean and smooth.

Step 4: Seal knots with knotting solution

Knots in bare or newly exposed softwood contain resin that can bleed through paint, leaving brown or yellow patches that reappear even after several coats. Knotting solution seals them so they cannot show through. Brush a thin coat over each knot and let it dry before you prime. It is a thirty-second job that prevents a fault you cannot easily fix later.

Step 5: Prime, then fill and caulk

Bare wood, filler and any stained patches need priming so the topcoat has a uniform, well-sealed base to sit on. On fully bare timber, an appropriate wood primer or primer-undercoat is the foundation of a lasting finish.

There is a small professional habit worth borrowing here: prime before you caulk. Filling and caulking against a primed surface makes the gaps easier to see, helps you spot imperfections in your filler, and stops bare wood drawing moisture out of the caulk too quickly.

Filling versus caulking

These are two different jobs, and using the wrong product is a common mistake. Wood filler is for holes, dents, splits and chips in the timber itself; sand it smooth once dry, and expect deep holes to need a second application. Decorator’s caulk is for gaps, the line along the top of skirting, around architraves, and where trim meets the wall. It stays flexible and is paintable, so smooth the bead with a wet finger or a caulking tool. Keep silicone sealant for wet-area joints such as around a bath; in its standard form it cannot be painted, so it has no place on surfaces you intend to coat.

Step 6: Choose the right paint

Woodwork paint comes in water-based and oil-based (solvent-based) systems. Both can give a beautiful result, and the right choice depends partly on the look you want and partly on where the woodwork is. This is about the paint type; for which sheen level to pick, matte through to gloss, see our separate guide below.

Step 7: Apply thin coats and sand between them

The secret to a smooth, professional finish is thin coats, not thick ones. Load the brush no more than about a third of the way up the bristles and wipe off the excess; an overloaded brush is what causes runs and drips. A 2-inch (50mm) angled brush gives good control on most skirting and trim.

Work in manageable sections of around half a metre. Cut in the edges first, then fill the middle, and make your final stroke a light pass along the length of the board so the brush marks run with the wood, not across it. This is what professionals call ‘laying off’.

1. Apply the first coat thinly and evenly, and let it dry fully.
2. Lightly sand with a fine paper to knock back any raised grain or specks, then wipe off the dust.
3. Apply the second coat the same way. Most jobs need two coats over a primed surface for an even, opaque finish.

Always follow the guidance on the tin, as some modern water-based ranges are formulated so you do not need to sand between coats. When in doubt, a light de-nib between coats rarely hurts the result.

Common woodwork mistakes (and how to avoid them)

When to call a professional

Plenty of homeowners paint their own skirting and get a perfectly good result. It becomes worth bringing in a professional when the scope or the stakes rise: a whole house of woodwork, staircases and spindles that are awkward and time-consuming, old paint that needs stripping back, suspected lead paint, or simply when you want a flawless, hard-wearing finish that lasts and frees up your weekends.

A professional decorator brings the preparation discipline that determines how long the finish lasts, the right products for each surface, and a clean, tidy process. For older and period properties, where original timber and possible lead paint call for extra care, that experience matters even more.

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