Buying guides · 4 min read
How to Choose Exterior Paint That Actually Lasts
Preparation, substrate, and product type decide longevity far more than brand does.
Exterior paint fails early for predictable reasons, and almost none of them are the paint being cheap. Surface preparation, the wrong product for the substrate, and painting in the wrong conditions account for most repaint jobs that come around years too soon.
In this story
- 1. Preparation is most of the job
- 2. Match the product to the substrate
- 3. Know what elastomeric and mineral paints are for
- 4. Use low sheen on walls, satin on trim
- 5. Prime properly, or don't bother painting
- 6. Respect the application window
- 7. Two coats, properly spaced
- 8. Dark colours fade faster
- 9. Sun exposure varies by elevation
- 10. Set a realistic repaint expectation
Buying guides
Preparation is most of the job
Washing off dirt and chalking, scraping loose material, filling, and sanding edges is the bulk of the labour and the bulk of the outcome. Expensive paint over poor preparation fails at the same rate as cheap paint — it just fails more expensively.
Buying guides
Match the product to the substrate
Render, timber, brick, and metal each want different things. Masonry wants a breathable coating that lets trapped moisture escape; timber wants flexibility to move with the seasons; metal wants corrosion inhibition. Using one product everywhere is the most common cause of premature failure.
Buying guides
Know what elastomeric and mineral paints are for
Elastomeric coatings are thick and flexible, designed to bridge hairline cracks in masonry — useful on render, unnecessary elsewhere, and they trap moisture if used where the wall needs to breathe. Mineral paints bond chemically to masonry and breathe exceptionally well, which suits older solid-wall buildings.
Buying guides
Use low sheen on walls, satin on trim
Shine exaggerates every ripple and imperfection across a large wall, and walls have plenty. Trim and doors benefit from satin, which wipes clean and defines edges crisply. This is a durability decision as much as an aesthetic one — higher sheen generally resists weather better.
Buying guides
Prime properly, or don't bother painting
Bare timber, bare masonry, patched areas, and anything with tannin or rust need the correct primer. Paint applied straight onto these fails by peeling rather than by weathering — which means the whole surface comes off, not just the topcoat.
Buying guides
Respect the application window
Most exterior paints have a temperature and humidity range for application and curing. Painting too cold, too hot, in direct midday sun, or with rain forecast within the cure window all compromise film formation. The paint can look fine and still fail in a year.
Buying guides
Two coats, properly spaced
One heavy coat does not equal two thin ones — film thickness and adhesion are built in layers, with recoat times that exist for a reason. Rushing the second coat before the first has cured properly is a quiet, common shortcut that shortens the life of the whole job.
Buying guides
Dark colours fade faster
Deep and saturated colours absorb more UV and shift visibly sooner, particularly on elevations getting hard afternoon sun. If you want a dark facade, accept a shorter repaint cycle, or reserve the dark colour for trim and doors where repainting is quick.
Buying guides
Sun exposure varies by elevation
The south-facing wall in a hot climate will weather considerably faster than the shaded side. It's reasonable to spend more on the exposed elevations, and to expect to touch them up on a different schedule rather than repainting the whole house at once.
Buying guides
Set a realistic repaint expectation
Even a well-executed exterior is a maintenance cycle, not a permanent finish — typically several years to a decade depending on climate, exposure, and substrate. Planning for that beats being surprised by it, and catching failures early is much cheaper than a full strip and redo.
