Should I prime before painting?

Yes, you should prime before painting in most situations. Primer creates better paint adhesion, improves coverage, and ensures your topcoat looks its best and lasts longer.

When primer is essential: You absolutely need primer when painting over bare wood, drywall, metal, or previously painted surfaces with a different sheen or color. If you're going from dark to light colors, switching paint types (oil to latex or vice versa), or painting over stains, water damage, or crayon marks, primer is non-negotiable. New drywall is particularly porous and will drink up paint without primer, leaving you with uneven coverage and requiring multiple expensive topcoats.

Ottawa's climate considerations make primer even more important for exterior projects. Our harsh freeze-thaw cycles, UV exposure, and moisture from snow and rain demand maximum paint adhesion. Skipping primer on exterior surfaces like siding, trim, or decks often leads to premature peeling and costly repainting within 2-3 years instead of the expected 7-10 years.

When you might skip primer: High-quality paint-and-primer-in-one products can work for similar color changes over previously painted, well-prepared surfaces in good condition. However, these combination products cost $60-80 per gallon compared to $30-40 for separate primer and paint, so the convenience comes at a premium.

Professional guidance: For interior work, use a high-quality latex primer ($25-35/gallon) followed by your chosen topcoat. For exteriors, especially on Ottawa's older homes with multiple paint layers, consider having a contractor assess whether specialized primers are needed for adhesion or stain-blocking. Oil-based primers work best for bleeding woods like cedar or redwood common in Ottawa-area homes.

Next steps: Clean and sand your surfaces first, then apply primer with the same technique you'll use for the topcoat. Allow full cure time (usually 4-6 hours for latex primer) before applying paint. For large projects or exterior work, consider consulting our directory of painting professionals who understand Ottawa's specific climate challenges.