Do I always need to use primer before painting walls in my New Brunswick home?

Not always — but skipping primer on the wrong surfaces is the single most common cause of painting failures, and in New Brunswick's older housing stock, priming is necessary far more often than many homeowners expect.

There are genuine situations where you can skip a separate primer coat. If you're repainting a wall that's already in good condition — the existing paint is adhering well, the surface is clean, the colour change is subtle (say, a medium grey over a similar shade of beige), and you're using a high-quality self-priming paint — you can often get away with two coats of topcoat alone. Most premium paints like Benjamin Moore Regal Select, Sherwin-Williams Duration, and Dulux Diamond are formulated with good hide and adhesion built in. On a previously painted, problem-free wall, they can work without a separate primer step.

However, primer is not optional in these situations:

You absolutely need primer on bare or new drywall. The paper facing on new drywall is porous and absorbent — paint soaks in unevenly and the finish looks flat and blotchy, a condition called flashing. A PVA drywall primer seals the paper and gives you a uniform surface. Many older NB homes in Fredericton and Moncton were skimmed with compound during renovations, exposing raw drywall — always prime these patches before painting.

Primer is also essential when painting over raw or bare wood (trim, doors, baseboards), significant colour changes (going from a dark red to a light grey), stained or water-damaged areas, nicotine or smoke-stained walls, new plaster or joint compound patches, and any surface that has been sanded down to bare material. In each of these cases, skipping primer leads to poor adhesion, uneven colour, stains bleeding through, or a finish that peels within a year.

NB-specific consideration: Many homes built before 1970 in Saint John, Fredericton, and Moncton have original plaster walls. Old plaster is highly alkaline, especially if it's never been painted or has been repainted many times without a proper primer between cycles. High-alkalinity surfaces saponify latex paint — essentially turning it into soap from the inside, causing the film to soften and peel. Use a quality alkali-resistant primer on old plaster before any latex topcoat.

The practical approach: prime whenever there's any doubt, especially if you're doing walls in an older home, changing colour significantly, or painting over any repaired areas. A gallon of primer costs 5-50 and takes maybe an extra hour to apply. The alternative — peeling, blotchy, or failing paint that you have to redo in a year — is far more expensive and frustrating.

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