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How to Weatherproof Outdoor Patio Furniture with Harris Brushes

Publish date
6th August 2026
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In this article

2025 painting trends
2025 painting trends

The Essential Step-by-Step Guide

Preparation is the foundation of a great finish that survives the elements.

  • Clean: Wash the furniture with mild soap, water, and a stiff brush to remove dirt and mildew. Rinse and let it dry completely.

  • Sand: Scrape away any flaking paint. Use fine-grit sandpaper (180-240 grit) to create a "key" for the new finish to grip. This is especially crucial when weatherproofing painted wood furniture.

  • Dust: Wipe away all sanding dust with a clean, dry cloth.

For bare wood or metal, apply an exterior-grade primer. Make sure to use a good-quality brush, and apply either a water-based primer or an oil-based one depending on the material. Allow it to dry for at least 2 hours, but ideally up to 8.

When you weatherproof outdoor patio furniture, the quality of application matters as much as the paint itself.

  • Technique: Use long, smooth strokes following the wood grain. Avoid thick layers that might run or peel.
  • Multiple Coats: Two or three thin coats are far more durable than one thick one. Lightly sand between coats for a professional finish.

The final step in weatherproofing outdoor and painted wood furniture is the topcoat.

  • Apply Sealant: Use a clear exterior polyurethane sealer or outdoor varnish. Turn the furniture upside down and apply a coat to the legs and undersides first to catch any drips.
  • Cure: Let the furniture cure for 24 to 48 hours before use.

Our Recommended Brushes

Surface / Task

Recommended Tool

Why it’s great

Table Tops & Benches

Seriously Good 5" Brush

Speeds up coverage on large timber areas.

Intricate Detailing

Seriously Good 2" Brush

Better leverage for undersides and deep crevices.

Fast Coverage

Ultimate Swan Neck Brush

Great for painting large areas quickly and smoothly.

Metal or Textured

Seriously Good 4" Metalwork Brush

Firm bristles that work paint into pitted or metal surfaces.

Surface Preparation

Seriously Good Wire Brush

Scrapes away rust, algae, and flaking paint.

2025 painting trends

FAQs

You should always select an exterior-grade paint with UV protection and built-in flexibility. This allows the paint to handle the natural expansion and contraction of wood during temperature changes without cracking.

Depending on exposure, most wooden sets benefit from a light sanding and a fresh topcoat every 1–3 years to maintain their protective barrier.

It is best to use a clean, high-quality brush for your topcoat to make sure no pigment from your paint contaminates the clear sealer. Our Seriously Good range offers excellent versatility for both tasks.

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