How do I prepare a wall in my Dieppe home for new wallpaper after removing the old layer?

Preparing a wall for new wallpaper after removal is mostly about getting the surface perfectly smooth, sealed, and stable — and in a Dieppe home, that means paying close attention to what the old wallpaper left behind.

Wallpaper removal is notoriously hard on walls. Whether your Dieppe home has drywall or plaster (common in older homes throughout Greater Moncton), the removal process almost always leaves behind adhesive residue, torn paper facing, gouges, and soft spots. Painting or papering over any of these without proper prep leads to bubbling, peeling, and an uneven finish that shows through the new wallpaper.

Step 1: Remove all adhesive residue. After stripping the old wallpaper, the wall will likely feel sticky or rough from leftover paste. Mix a solution of warm water and a small amount of fabric softener or a dedicated wallpaper remover (DIF is widely available at hardware stores in Moncton and Dieppe), sponge it onto the wall in sections, and scrub with a nylon brush. Rinse thoroughly with clean water and let the wall dry completely — in NB's humid summer conditions, this can take 24-48 hours. Don't rush this step.

Step 2: Repair the surface. Once dry, inspect every inch of the wall. In older Dieppe homes, you'll often find torn drywall facing (the paper layer of the drywall itself gets ripped off during wallpaper removal), small gouges, nail pops, and hairline cracks. Use a lightweight joint compound (not setting-type compound — it's harder to sand) to skim over torn facing, fill gouges, and feather out any uneven areas. For larger repairs, apply two or three thin coats, letting each dry fully and sanding lightly between coats with 120-grit sandpaper. Finish with 150-grit for a smooth surface.

Step 3: Prime with a high-quality oil-based or shellac primer. This is the step most DIYers skip — and it's the most important one. Torn drywall facing and repaired areas are highly absorbent and will cause new wallpaper paste to soak in unevenly, leading to bubbles and adhesion failure. A shellac-based primer like Zinsser BIN ($45-65/gallon) seals everything uniformly and prevents the paste from soaking into the wall. Some professionals use an oil-based primer instead. Avoid water-based primers at this stage — they can re-wet the joint compound and raise the paper facing on repaired spots.

NB-Specific Consideration: Dieppe's proximity to the Petitcodiac River and the general Greater Moncton humidity means walls in older homes can carry more moisture than you'd expect, especially in basements and on exterior-facing walls. If you notice any soft, crumbly plaster or damp spots, don't paper over them — get the moisture source assessed before proceeding. Wallpaper traps moisture against the wall and accelerates mould growth behind it.

Practical Tips:

• After priming, lightly sand the entire wall with 150-grit to knock down any texture or brush marks from the primer


• Apply a thin coat of wallpaper sizing (a diluted adhesive primer) over the primed wall before hanging — this makes the wallpaper easier to slide into position and improves long-term adhesion


• Check the wall with a raking light (a flashlight held at a sharp angle to the surface) to spot any remaining bumps or low spots before you hang a single strip

When to Hire a Pro: If the wallpaper removal left significant damage — large areas of torn drywall facing, multiple layers of old paper, or plaster that's crumbling — a professional drywall finisher or painter should skim coat the entire wall before you proceed. Trying to patch dozens of small damaged areas yourself often results in a wall that looks worse under new wallpaper than it did before. For a seamless result in a main living area or dining room, professional prep work is genuinely worth the investment.

Need help finding a painting or finishing professional in the Dieppe/Moncton area? New Brunswick Painting can match you with a local pro for free — browse the directory at newbrunswickconstructionnetwork.com/directory?trade=painting.