How do I spray paint exterior siding with an airless sprayer on my NB home?

Spraying exterior siding with an airless sprayer is fast and produces excellent coverage, but it requires thorough masking, proper tip selection, and ideal weather conditions — all of which matter even more in New Brunswick's unpredictable Maritime climate. Done right, it cuts painting time dramatically. Done wrong, it creates overspray damage, uneven coats, and a finish that fails early.

Before you even load the sprayer, preparation is everything. Cover all windows, doors, light fixtures, and any surfaces you do not want painted with plastic sheeting and painter's tape. On a typical NB home with wood or vinyl siding, this masking step takes longer than the actual spraying — budget 4-6 hours for a bungalow. Turn off any forced-air HVAC intakes near where you are spraying to prevent overspray from entering the house. Warn neighbours on windy days, as airless sprayers can throw fine mist considerable distances.

Tip selection is critical. For most exterior siding paint (100% acrylic latex), a 515 or 517 tip is standard — the first number (5) refers to the fan width in inches when doubled (a 5 = 10-inch fan), and the second pair (15 or 17) is the orifice size in thousandths of an inch. Thicker paints like elastomeric or solid deck stains need a 619 or 621 tip. Set your pressure high enough to fully atomize the paint but no higher — excess pressure creates excessive overspray and bounce-back. Test on a piece of cardboard first.

NB weather conditions must be respected. Only spray when temperatures are between 10°C and 30°C, wind is below 15 km/h, and there is no rain in the forecast for at least 24-48 hours. The morning window — after the dew has burned off (typically 9 AM) and before the afternoon wind picks up — is the sweet spot during NB's May to October painting season. Never spray in direct hot afternoon sun, as the paint will dry before it can level properly, causing an orange-peel texture.

Hold the sprayer gun 30-40 cm (12-16 inches) from the surface and move in smooth, overlapping horizontal strokes, keeping the gun perpendicular to the wall at all times. Trigger before each pass begins and release after it ends — this avoids heavy spots at the start and finish of each stroke. Overlap each pass by 50% for uniform coverage.

Back-rolling is strongly recommended for first coats on bare or weathered wood siding. Have a helper follow immediately behind with a roller to work the paint into the grain and any surface irregularities. This dramatically improves adhesion and reduces the chance of peeling — critical for NB's freeze-thaw cycle environment.

For most homeowners painting a two-storey NB home, renting the sprayer is straightforward but working safely at height is not. Working from extension ladders with an airless sprayer hose requires experience and a spotter. For full-house exterior spraying above the first storey, hiring a professional painting crew is well worth the investment — they have the equipment, crew, and experience to complete the work safely and quickly within NB's short exterior season. Get matched with local exterior painters through New Brunswick Painting at no cost.

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