Painting Over Wallpaper: When It Works and When It Doesn't

The question of whether to paint over wallpaper or strip it first comes up in almost every decorating project in the UK, where Victorian and Edwardian terraces are peppered with layer upon layer of decades-old wallpaper. The truthful answer is: it depends. There are situations where painting over wallpaper works perfectly well and saves considerable time and mess. There are other situations where attempting it will produce a disaster that costs more to fix than if you'd stripped the paper first. This guide gives you the honest information to make the right call for your specific situation.

When Painting Over Wallpaper Actually Works

Let's start with the good news: there are genuine scenarios where painting over wallpaper is not only acceptable but arguably the sensible choice.

The paper is firmly adhered with no lifting edges

Run your hand firmly over the entire wall. If the wallpaper is fully bonded to the plaster — no bubbles, no peeling corners, no seams lifting — and has been for many years, it may be better to leave it in place. Stripping old paper in Victorian homes sometimes reveals the paper was doing a structural job of holding crumbling lime plaster together. Remove it, and you're looking at replastering costs of £200–£600 per room.

There is only one layer of wallpaper

Multiple layers cause problems — the combined thickness of paper, old paste and paint becomes significant enough to telegraph through to the finished surface. One layer of good quality wallpaper that's well stuck down is usually fine to paint over.

The paper has a smooth, flat surface

Textured papers — woodchip being the most notorious example in UK housing — can be painted over, but the texture will remain visible. If you're happy with that (and some people genuinely are for certain applications), paint away. If you want a smooth finish, you need to strip the paper regardless.

You're painting a low-priority space

Utility rooms, garages, storage areas — spaces where aesthetics are secondary to function — are reasonable candidates for painting over wallpaper as a quick solution.

When You Must Strip the Wallpaper First

Be honest with yourself about these situations, because painting over wallpaper when these conditions apply will give a result that disappoints — and that you'll have to redo sooner than you'd like.

The paper is already lifting or bubbling

Paint adds weight and moisture. If the paper is already failing to stick, adding a layer of emulsion will accelerate the delamination. Within weeks you'll have bubbling paint following the bubbling paper. Strip it now, or accept you'll be stripping it in six months with painted paper on top — which is even harder to remove.

There are multiple layers

Two or more layers of wallpaper should always be stripped. The seams of lower layers will eventually show through, the combined thickness creates edges at every seam, and if any layer fails, the whole wall fails at once.

The paper is in a bathroom or kitchen

High humidity causes wallpaper adhesive to fail over time. In a bathroom or kitchen, painting over wallpaper is asking for trouble. The steam causes the paper to expand; when it dries it contracts. Eventually the seams lift and the paint goes with them. Strip it.

You want a perfect finish for a main room

Seams, texture and any imperfections in the paper will be visible through paint, especially in raking light — the light that travels at a low angle across a wall surface, typically near windows. For living rooms, dining rooms and bedrooms where you're investing in quality paint and care about the result, stripping gives a far superior outcome.

The paper is heavily textured (woodchip)

Woodchip is the great scourge of UK home improvement. Millions of homes had it fitted in the 1970s and 1980s as a cheap way to hide poor plasterwork. It's possible to paint over it, but the chips telegraph through paint no matter how many coats you apply, and the result looks amateurish in any room you care about. Strip it. Yes, it's a miserable job — but it's worth it.

How to Prepare Wallpaper for Painting (If You've Decided It's Appropriate)

Assuming your wallpaper passes the criteria above, here's how to prepare it properly. The preparation is everything — skip any of these steps and you'll regret it.

Step 1: Fix any lifting edges and seams

Use Polycell Ready Mixed Overlap & Repair Adhesive (around £6 at B&Q) or Solvite Overlap & Repair adhesive to re-bond any lifting edges or bubbling sections. Apply, press firmly and use masking tape to hold down while it dries. Allow 24 hours minimum. Dry-scrape any proud edges down with a flexible filling knife.

Step 2: Fill seams and holes

Wallpaper seams need to be filled before painting, otherwise they'll show through. Use a flexible filler — Polycell Fine Surface Polyfilla is a good choice — and apply it thinly with a wide filling knife. Press it into the seams and feather the edges. Allow to dry completely, then sand lightly with 120-grit sandpaper. You'll likely need two applications for a flat result. Don't use expanding filler — you want something that shrinks slightly to sit flush.

Step 3: Apply a size or stabilising primer

This is the step most beginners skip — and it's the one that matters most. Applying emulsion paint directly to wallpaper soaks moisture into the paper, causing it to expand and bubble. You must apply a sealing coat first. Options:

• Diluted PVA (Unibond): Mix PVA with water at a ratio of approximately 5:1 (water:PVA). Apply one coat and allow to dry fully. This seals the paper and prevents the emulsion from softening the paste underneath.
• Zinsser Gardz: A purpose-made penetrating sealer that works exceptionally well on wallpaper. Slightly more expensive at around £25 for 1 litre, but significantly better performance than PVA in tricky situations. Recommended if the paper has any marginal areas.
• Polycell Wallpaper Overlap and Repair Sealer: The high street option, available from B&Q and Wilko.

Step 4: First coat of paint

Use a good quality emulsion — Dulux Easycare or Crown Breatheasy are solid UK choices. Apply a thinned first coat (add 10% water) to help penetration without putting on too much moisture at once. Use a roller for walls, brush for edges. Don't overwork wet areas — you risk lifting the paper.

Step 5: Sand lightly and apply full-strength topcoats

Allow the first coat to dry fully (at least four hours at room temperature — more in winter). Sand lightly with 180-grit sandpaper to knock back any raised fibres or grain. Two further full-strength coats should give a solid result.

How to Strip Wallpaper Properly (When You Need To)

If your assessment has led you to the conclusion that stripping is necessary, here's how to do it with minimal pain.

Tools and materials

• Wallpaper steamer (hire from HSS or Speedy Hire for around £30/day — worth every penny for a full room)
• Wide stripping knife (100–150mm)
• Scoring tool (Zinsser Paper Tiger is the best-known UK option)
• Sugar soap
• Drop cloths (essential — this gets very wet and messy)

The method

1. Score the paper with the scoring tool. This creates perforations that allow steam or water to penetrate the paste layer. Don't score too aggressively on plasterboard — you'll pierce the paper face of the board.
2. Use the steamer in 30-second applications, moving the plate systematically across sections. The steam softens the paste beneath.
3. Immediately strip with the wide knife while the paste is soft. Work quickly — it re-hardens as it cools.
4. On old lime plaster walls, be gentler — lime plaster is softer than modern gypsum and can be gouged by heavy-handed stripping.
5. Once stripped, wash down the walls with warm water and sugar soap to remove all paste residue. Any remaining paste will prevent paint from adhering properly.
6. Allow to dry thoroughly — at least 48–72 hours in a ventilated room — before any filling or priming.

Common Mistakes

• Applying emulsion directly to paper without sealing: The single most common cause of bubbling and failure.
• Rushing the drying times: Wallpaper paste takes longer to dry than you expect. Patience here prevents having to redo the whole job.
• Not repairing seams before painting: Seams always show through. Always fill them.
• Using too much water when stripping near plasterboard: Modern homes (post-1980s) often have plasterboard stud walls. Excessive water can swell and damage the plasterboard face. Use a steamer rather than sponging water and work quickly.
• Skipping the wash-down after stripping: Paste residue left on walls prevents paint adhesion and causes patchy results.

Summary

Painting over wallpaper is a legitimate option in specific circumstances: paper that is fully adhered, a single layer, a smooth surface and a non-humid room. In those cases, seal thoroughly before painting and fill every seam. Where any of those conditions aren't met — particularly in bathrooms, kitchens or rooms with multiple layers — strip first. The stripping job is a weekend's miserable work, but the resulting flat, smooth painted surface will look dramatically better and last significantly longer than paint applied over unsuitable wallpaper.