What is the difference between latex and oil-based paint and when should I use each in NB?

Latex paint (water-based acrylic) is the right choice for almost every residential painting project in New Brunswick today — but oil-based paint still has specific applications where it genuinely outperforms, particularly on certain trim surfaces and where you need maximum hardness.

The core difference is in the binder — the part of the paint that forms the film and determines durability. Latex paint uses an acrylic or vinyl-acrylic resin suspended in water. It dries relatively quickly (touch-dry in 1-2 hours, recoatable in 2-4 hours), cleans up with soap and water, has lower VOC content, and stays flexible as it ages. Oil-based paint (also called alkyd paint) uses a linseed or soy oil-derived resin suspended in mineral spirits or other solvents. It dries slowly (touch-dry in 6-8 hours, recoatable in 24 hours), requires solvent cleanup, produces more fumes, and dries to an exceptionally hard, smooth film. Traditional oil-based paint becomes brittle with age, which is a critical problem in New Brunswick’s climate.

In NB’s Maritime climate, 100% acrylic latex has largely replaced oil-based paint for exterior use — and for good reason. Acrylic latex stays flexible through the province’s 100+ annual freeze-thaw cycles, while an oil-based film becomes rigid and cracks as temperatures swing from -20°C in February to +30°C in July. Acrylic latex is also breathable — it allows moisture vapour to escape from wood siding and trim — while oil-based paint traps moisture, leading to blistering and peeling in the damp Maritime environment. If you see peeling paint in sheets on older NB homes, there is a good chance old alkyd or oil-based exterior paint is involved.

Where oil-based (or alkyd) paint still earns its place:

• Interior trim, doors, and railings — the extremely hard film that oil-based alkyd paint produces resists dings, scrapes, and wear better than most latex products. This matters on stair railings, door edges, and baseboards that take daily abuse.


• However, modern acrylic-alkyd hybrid paints — products like Benjamin Moore Advance or Sherwin-Williams ProClassic Waterborne Alkyd — bridge this gap beautifully. They clean up with water, have lower VOC content, dry faster than traditional oil, and cure to a hard, smooth finish that rivals traditional alkyd. These are the best of both worlds and are now the dominant choice among NB painting professionals for interior trim and cabinet work.

Practical guidance for NB homeowners:

• For walls and ceilings: always use latex. No exceptions.


• For exterior: always use 100% acrylic latex. Never oil-based on NB exteriors.


• For interior trim and doors: use a water-based acrylic-alkyd hybrid (Benjamin Moore Advance or Sherwin-Williams ProClassic) for the best combination of hardness and workability.


• For stain blocking over water stains, smoke, or knots: shellac-based primer (Zinsser BIN) or oil-based primer as a spot coat, then latex top coats.

One important note for older NB homes: if you are repainting trim or doors that were originally painted with oil-based paint (common in homes built before 1990), sand the surface lightly and apply a bonding primer before latex or acrylic-alkyd hybrid top coats. Latex applied directly over glossy, unconditioned oil-based paint is likely to peel.

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