How Durable is Exterior Wood Paint — Really?

    Introduction

    Exterior wood paint isn’t just about colour — it’s about protecting timber from the elements for years to come. But durability can vary widely depending on wood type, preparation, and the paint itself.

    In this guide, we explain how long exterior wood paint really lasts and what you can do to make sure your timber stays protected.

    What affects wood paint durability?

    Several factors determine how long paint will last:

    1. Wood type

    • Softwood (pine, spruce): Paint penetrates easily; usually longer-lasting.

    • Hardwood (oak, mahogany): Tighter grain means paint sits more on the surface; may need more maintenance.

    • Tropical hardwoods (teak, iroko): Very dense; proper surface prep is essential.

    2. Surface preparation

    Durability starts before you paint. Proper cleaning, sanding, and priming help paint stick and resist weathering. Skipping prep is the quickest way to reduce lifespan.

    3. Exposure

    • Sheltered vs exposed: Horizontal surfaces, coastal locations, and areas in direct sun or rain wear faster.

    • Paint on vertical, sheltered panels can last significantly longer.

    4. Film thickness & application

    • Too thin → quicker wear

    • Too thick → cracking or peeling

    • Even coats, applied according to guidelines, give the best protection.

    5. Paint quality

    Not all paints are created equal. Thorndown Wood Paint is:

    • Breathable — lets timber release moisture

    • Flexible — moves with wood as it expands and contracts

    • Low VOC — safer for people and the environment

    These features help the coating last longer without cracking or flaking.

    Typical lifespan ranges (guidance)

    Wood Type Typical Lifespan Notes
    Softwood 5–7 years With good prep & two coats
    Hardwood 3–5 years Surface prep critical
    Tropical hardwood 2–4 years Sanding & priming recommended

    Keep in mind these are averages. Proper prep, maintenance, and climate all influence longevity.

    Tips to maximise durability

    1. Always clean and sand the wood first.

    2. Apply primer where recommended, especially on old or dense hardwoods.

    3. Follow the correct drying time between coats.

    4. Inspect your painted timber every year — touch up areas exposed to harsh weather.

    5. Avoid painting over wet or unseasoned wood.

    When durability matters most

    Durability is particularly important for:

    • Windows, doors, and sills

    • Fences, gates, and decking

    • Any timber in exposed locations

    Choosing the right paint and applying it carefully saves time, money, and frustration over the years.

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