What is the best way to prepare walls for painting after removing wallpaper in NB?

After wallpaper removal, walls need cleaning, repair, priming, and sometimes skim coating before they're ready for paint. Skipping any of these steps and going straight to paint is one of the most common mistakes homeowners make — the resulting finish shows every imperfection and adhesive ghost.

The first step is washing the walls thoroughly. Wallpaper adhesive leaves a residue that is nearly invisible when dry but shows right through paint as shiny patches, streaking, or fish-eye spots. Wash the entire wall surface with warm water and a sponge, changing the water frequently. For stubborn residue, a small amount of white vinegar in the wash water helps dissolve the old paste. Let the walls dry completely — in NB's climate, give them at least 24 hours with good ventilation. In humid summer conditions in Moncton or along the coast, run a dehumidifier and a fan to speed drying.

Surface repair comes next. Inspect every centimetre of wall under raking light — hold a lamp close to the wall and look for dings, tears in the drywall face paper, gouges from the scraper, and areas where the surface is rough or bubbled. Small dings fill with spackling compound or lightweight joint compound (USG and CGC products are widely available in NB). Areas where the drywall face paper tore need to be sealed with an oil-based primer or shellac-based primer first — without this step, the torn paper will bubble and rise when water-based products are applied. Let repairs dry fully, then sand smooth with 120-grit sandpaper and wipe clean.

Primer is non-negotiable on post-wallpaper walls. The wall surface has adhesive residue, repaired areas, possibly torn drywall paper, and different levels of porosity all competing to absorb paint unevenly. A quality stain-blocking primer ties all of this together. Gardz (by Zinsser) is a product specifically designed for post-wallpaper walls — it's a penetrating primer that hardens damaged drywall paper and seals adhesive residue. Apply one coat and let it dry. You can find it in NB at larger paint stores.

For walls with significant surface damage or texture variation, a skim coat — a thin layer of drywall joint compound spread with a wide knife and sanded smooth — may be needed before priming. This is extra work but produces a noticeably smoother finish.

After priming, do one final inspection in raking light before painting. It's much easier to fix a spot at this stage than after you've rolled on two coats of your chosen colour.

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