Deck Stain vs Sealer vs Paint: Which & When 2026

Stain, for most wood decks. A semi-transparent stain adds colour and UV protection while the grain still shows, and it lasts two to four years against one to two for a clear sealer — so it is both the better-looking and the less frequent job. Choose a clear or lightly toned sealer only when keeping the wood's natural tone matters more than longevity, and accept that the deck will grey as UV works on the exposed timber; a sealer waterproofs but does comparatively little against sunlight, which is what actually changes the colour. Two conditions override the preference. New pressure-treated lumber has to dry out first, often a couple of months, before it will absorb anything. And on wood that is already weathered and patchy, a semi-transparent finish will show every one of those variations, which is the point at which a solid stain becomes the sensible answer.

Clear sealer lasts about one to two years, semi-transparent stain two to four, and solid stain or paint three to seven. Those windows assume decent prep; they shorten fast without it. Three things move a deck within its range. Sun exposure is the biggest — a south-facing deck with no shade can lose a season off any finish. Foot traffic is the second, which is why the path from the door to the steps always fails first while the corners still look fine. Prep is the third and the one you control: applying over a damp deck or over a failing previous finish traps moisture underneath and causes early peeling, whatever the label promises. The practical read is to plan on recoating the traffic lane sooner than the whole deck, and to strip back to clean dry wood whenever the old finish is flaking rather than simply worn.

It is the hardest finish to undo, which is the real argument against it rather than performance. Paint forms a film on top of the wood instead of penetrating it, so on a horizontal surface that collects water, takes foot traffic and moves with the seasons, that film eventually lifts — and once paint starts peeling on a deck the only honest fix is stripping or sanding the whole surface back. It lasts three to seven years, the same range as solid stain, so it is not buying extra life either. Where paint genuinely earns its place is wood that is already badly weathered, mismatched after board replacement, or previously painted, since a solid opaque film is the only thing that will make it look uniform. On sound wood with grain worth showing, a semi-transparent or solid stain gives you colour without committing every future owner to repainting.

Yes, but not on the day it is built — and this is the most common finishing mistake on new decks. Pressure-treated lumber leaves the yard saturated with treatment solution, and until that moisture leaves the boards, a stain or sealer cannot soak in. Applied too early it sits on the surface, dries unevenly and fails within a season, which then requires stripping before the deck can be finished properly. Give it a couple of months of dry weather; the traditional test is to sprinkle water on the boards and see whether it beads, which means the wood is still too wet, or soaks in, which means it is ready. Cedar can usually be finished sooner because it is not pressure-treated in the same way. Whatever the timber, do not finish over a damp deck or a failing old coat.

DIY materials run roughly $0.50 to $1.50 per square foot per coat, so a 300 square foot deck takes about $150 to $450 in product, plus brushes, a stripper if the old finish is failing, and a weekend. Hiring it out adds labour on top, and the prep is most of that labour rather than the application. Two things change the long-run figure more than the price per gallon. Finish choice: solid stain costs more up front than semi-transparent but is recoated every three to seven years instead of every two to four, so the annualised cost is usually lower. And prep quality: a stain applied over a clean, dry, stripped surface reaches the top of its stated life, while the same product over a grey or flaking deck can fail in a single season and cost the whole job twice.