The choice between deck stain and deck paint comes down to how each product interacts with wood, and that difference explains why painted decks require significantly more maintenance over time. Paint forms a rigid film on the wood’s surface, while stain penetrates the fiber and moves with the wood as it expands, contracts, and cycles through seasonal moisture changes. That bond line between paint and moving wood is where failure begins: cracking appears first at board edges and joints; peeling follows as moisture enters; and restoring a failed painted deck requires stripping or heavy sanding before any new product can bond properly. Stain ages differently: it fades rather than peels, leaves no failed film to remove, and refreshing it requires only cleaning and a new coat. Semi-transparent stain preserves visible grain on wood in good condition, while solid stain covers older or weathered surfaces with a uniform color. Both penetrate rather than form a film, retaining the flexibility advantage that sets stain apart. Proper surface preparation before application extends the finish further and makes future maintenance easier.
source: https://gildedpainting.com/why-deck-staining-lasts-longer-than-deck-paint/
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