Preparing Period Woodwork for Painting

Period woodwork, such as skirting boards, panelled doors, architraves and sash windows, carries decades of paint. Preparing it well is a patient job, and it decides how smooth and durable the finish will be. It also needs a sensible approach to safety, because older paint may contain lead. This article explains the general process and what to be careful about.

Key takeaways

• Do not dry-sand or burn off old paint in a pre-1980s home without precautions.
• Decide between stripping and keying by looking at the condition of the existing paint.
• Filling, caulking and priming are what make a finish look crisp and last.
• Sash windows need special care so they still open and close.

Start with safety: old paint and lead

Paint used in homes built before the 1980s may contain lead, and older layers underneath newer paint can still be present. Lead dust or fumes from dry sanding, power sanding and heat stripping can be harmful, particularly to children and pregnant women. As a general rule, do not dry-sand or heat-strip old paint in an older home unless you have taken proper precautions. Follow the official guidance from the Health and Safety Executive and GOV.UK. Wet methods, good dust control, suitable protective equipment and careful clean-up are the usual principles. If you are in any doubt, raise it before any work starts. Testing kits exist, but the safest assumption for a period house is that lead may be present.

Assess what is already there

Run your hand over the woodwork and look in corners and mouldings. Thick, lumpy layers that obscure carved details, peeling or crazed paint, or bare patches all suggest different treatments. Sound, well-bonded paint with a rough or glossy surface usually only needs cleaning and keying. Paint that is flaking or so thick that it buries detail may need to be stripped.

Stripping or keying?

Keying means lightly abrading a sound surface so the next coat grips. It is quicker and less invasive, and suits woodwork that is in good condition. Stripping removes paint completely, which is slower and messier, and is usually reserved for badly failing paint or where detail has been lost. The choice should be based on the evidence, not on habit, and stripping in a home that may contain lead needs the precautions above.

Cleaning, filling and caulking

Start by washing grease, smoke and dirt from the surface, since paint does not stick well to a dirty base. Rinse and allow to dry. Then:

1. Scrape away loose paint and feather the edges so they do not show as ridges.
2. Fill dents, nail holes and splits with a suitable wood filler, working it in and leaving slightly proud.
3. Sand the filler flush once it has dried, using a method that controls dust.
4. Apply flexible decorator's caulk to hairline gaps where woodwork meets walls, but not to joints that are meant to move.
5. Spot prime bare wood and filler before overall undercoating.

Timber that is soft, spongy or rotten needs repair by a joiner, rather than filling.

Primer and undercoat

Bare wood needs primer, and knots may need a knotting solution so resin does not bleed through. Undercoat builds an even, opaque base and gives the topcoat a consistent surface. Skipping it often leads to patchy colour and a finish that does not look deep. Allow each coat to dry fully and sand lightly between coats for smoothness. For more on why this sequence matters, see our article on what makes a professional paint finish different.

Sash windows

Sash windows have moving parts, and paint in the wrong place can glue them shut. Sliding surfaces and the sash cords or chains should not be painted over, while the exposed faces, sills and exterior joints are what need protecting. Old putty, where it has failed, should be replaced before painting, and paint should overlap slightly onto the glass to form a seal against water. Allow plenty of drying time before closing a sash fully.

Patience pays off

Preparing period woodwork is slow, but the difference shows, especially on mouldings and panels that catch the light. You can learn more about our approach on the specialist painting page. If you have a period home in Ponteland, Darras Hall or nearby and want to talk about the woodwork, request a quotation and mention the age of the property. We will discuss the approach and any precautions with you before anything begins.