How to Prep a House Before Exterior Painting in Newcastle

Step 1 — Wash all exterior surfaces

Start with a thorough pressure wash to remove dirt, cobwebs, mould, and salt buildup. For Newcastle homes near the coast, salt residue is the biggest hidden problem. It sits on surfaces invisibly and stops primer from gripping properly.

Use a garden hose for light dirt or a pressure washer at 1,500–2,000 PSI for heavier grime. Soft-wash settings work well for older weatherboard so you don't force water behind cladding. Allow 24 to 48 hours of dry weather before the next step.

Step 2 — Scrape and sand flaking paint

Once surfaces are dry, inspect for loose, peeling, or bubbling paint. Use a paint scraper to remove anything that lifts easily. Then sand the edges smooth so new coats blend cleanly into the existing surface.

Sound paint that is firmly bonded can stay. Removing it wastes time and exposes more bare substrate. Focus your effort on areas where coatings have clearly failed — around windows, fascia boards, and joins where moisture collects.

Step 3 — Fill cracks, gaps, and nail holes

Use a quality exterior filler for cracks and holes in timber, render, or fibre cement. For larger gaps around window frames, door frames, and where different materials meet, apply a paintable exterior sealant or caulk.

This step also helps with weatherproofing. Gaps that are left open allow moisture in behind cladding, which causes early paint failure from the inside out. After filling, sand smooth once cured and wipe away dust.

Step 4 — Spot-prime bare and repaired areas

Apply primer to any bare timber, exposed render, filled areas, and sanded spots. Primer creates a consistent base for topcoats, improves adhesion, and blocks tannin or stain bleed through from timber substrates.

For coastal properties in Newcastle, choose a primer designed for exterior conditions with moisture and salt tolerance. If you are painting over dark colours with a lighter shade, a tinted undercoat primer helps with coverage and reduces the number of finish coats needed.

Step 5 — Mask windows, trims, and fixtures

Protect glass, door handles, light fittings, and any surfaces that should not be painted by applying painter's tape and drop sheets. This step saves cleanup time and ensures sharp paint lines on trims and edges.

Also move or cover garden furniture, plants, and outdoor items near walls. Overspray and drips can travel further than you expect, especially if using a spray gun.

Coastal prep notes for Newcastle homes

Newcastle's coastal suburbs face extra exposure to salt spray, humidity, and UV. These factors accelerate coating breakdown, so prep quality matters more here than for inland properties.

• Wash salt residue off all surfaces — even if they look clean
• Check for mould in shaded areas under eaves and behind downpipes
• Use exterior-grade primers rated for moisture and salt conditions
• Allow longer drying times in humid weather (coastal air holds more moisture)
• Inspect metal fixings for rust and treat before painting over them