Stripping Paint in London Period Properties: Methods, Safety, and Lead Paint
How to strip paint from London's period properties correctly: heat gun, chemical stripper, and mechanical methods compared. Lead paint identification, testing, and safe removal.
When Stripping Is the Only Correct Answer
Most redecoration work can be done over existing sound coatings with proper preparation. But there are situations where stripping is unavoidable: where paint has built up to the point that joinery profiles are obscured, where an adhesion failure means any new coat will pull off with the old, where moisture is trapped behind multiple impermeable layers, or where the presence of lead paint means existing coatings must be fully removed before safe repainting can proceed.
London's period property stock — Victorian terraces, Edwardian semis, Georgian townhouses, and inter-war villas — contains a disproportionate amount of problematic buildup compared to newer construction. Windows painted shut, cornices with their detail buried under twenty coats, and skirting boards that are no longer skirting boards but painted blocks all require stripping before any meaningful decorative improvement can be made.
The Heat Gun Method
A hot-air heat gun is the most widely used tool for stripping painted woodwork. The principle is simple: the heat softens the paint film, which is then removed with a scraper before it re-hardens. A good quality variable-temperature gun — Steinel, Wagner, or Leister are the professional standards — allows fine control. Too cold and the paint doesn't soften; too hot and you char the timber and risk igniting the substrate.
The correct technique is to keep the gun moving and work the scraper immediately behind the heat, never pausing the heat in one position. On moulded profiles, use a shave hook rather than a flat scraper. For window glazing bars, reduce the temperature significantly and keep the gun moving — glass conducts heat rapidly and can crack if subjected to concentrated heat.
Heat guns and lead paint: Do not use a heat gun on surfaces that may contain lead paint. Lead paint vaporises at high temperatures, and the fumes produced are highly toxic. If there is any possibility the existing paint contains lead, test before applying heat.
Chemical Strippers
Chemical strippers work by penetrating the paint film and breaking the bond between it and the substrate. The two main categories in professional use are:
NMP-free solvent strippers (such as Barrettine Premium Paint Stripper, Peelaway 7, or Nitromors Professional): applied with a brush, left to work for a specified dwell time, and then removed with a scraper and neutralised with water. Effective on most paint types in two or three coats of application. Appropriate for detail areas where heat guns are awkward — cornices, banisters, complex profiles.
Paste strippers (such as Peelaway 1 and Peelaway 7): applied in a thick layer, covered with the proprietary paper blanket, and left for up to 24 hours. Particularly effective on thick, multi-layered paint buildup. Peelaway 1 is specifically formulated for lead paint, encapsulating lead particles in the alkaline paste as it works — the combination of paste and paper is removed intact and disposed of as hazardous waste.
Chemical strippers require proper PPE: nitrile gloves, eye protection, and adequate ventilation. Some formulations can cause skin sensitisation with repeated exposure; professional-grade products should be used with appropriate precaution.
Mechanical Methods
For large flat areas — flush doors, external rendered surfaces, plasterwork — mechanical stripping using an oscillating multi-tool, flat-bed sander, or angle grinder with a stripping disc is faster than heat or chemical methods. However, mechanical stripping generates significant dust, which creates a lead exposure risk on pre-1970 properties and an asbestos risk in textured coatings applied before 1984.
Always wear a minimum of FFP3 respiratory protection when dry sanding or mechanical-stripping painted surfaces in period properties. P2/P3-rated masks are not optional; lead particles are below 10 microns and pass straight through lower-rated masks. We carry calibrated air monitoring equipment on jobs where lead paint is confirmed.
Lead Paint: Identification and Testing
Lead was used as a white pigment base in paint until it was progressively phased out from the mid-1970s. Any property built before 1980 may contain lead paint, and properties built before 1960 almost certainly do. The highest concentrations are typically on exterior surfaces and on interior woodwork — skirting boards, window frames, and doors — where oil-based gloss paint was the standard finish.
Testing: DIY lead testing swabs (Detectachem, Lead Check) are available and will provide a quick positive or negative result on a visible surface. However, they only test the topmost layer. In a multi-layer buildup, the top coat may test negative while lower coats — accessible only after stripping begins — may contain lead. A more reliable approach is professional XRF (X-ray fluorescence) testing, which measures lead through all paint layers without requiring surface damage.
Safe removal: Where lead paint must be removed, the Control of Lead at Work Regulations 2002 set out the legal framework for safe working. Key requirements include: designated controlled work area, respiratory protection (FFP3 minimum), disposable protective clothing, no eating, drinking, or smoking in the work area, decontamination of tools and workers before leaving, and correct disposal of lead-containing waste as hazardous material.
In domestic properties, we use wet methods wherever possible — paste strippers or wet sanding — to minimise airborne dust generation. Dry sanding or heat gun work on confirmed lead paint requires the full regime above.
After Stripping: Getting the Surface Ready
Once stripped, timber surfaces should be allowed to dry fully before any priming. Check moisture content with a pin-type moisture meter — anything above 16% is too high for oil-based primer and above 18% for water-based. Prime bare timber as soon as it is dry enough; bare wood absorbs atmospheric moisture rapidly and begins to raise grain within hours of exposure.
Metal surfaces stripped to bare metal should be primed immediately — rust begins forming on ferrous metal within minutes in humid London conditions.
For advice on a stripping project or to arrange a free survey, contact us or use our free quote form.