Deck stain opacity — clear to solid, and the grain-versus-protection trade-off
Picking a deck stain is really picking opacity, and opacity is a trade-off. Clear and semi-transparent stains show the wood grain but fade in ~1–3 years; semi-solid and solid stains hide more grain but carry the most UV pigment, so they last ~3–5 years between recoats.
What this diagram shows
Four deck-stain opacity levels compared left to right on wood swatches, from least to most pigment. A clear or transparent sealer shows the full wood grain but carries the least UV-blocking pigment, so it fades and needs recoating in about one to two years. A semi-transparent stain lets the grain show clearly and lasts about two to three years. A semi-solid stain is heavy pigment with only some grain showing and lasts about three to four years. A solid color stain is opaque, hides the grain completely, carries the most UV-blocking pigment, and lasts the longest at about four to five years between recoats. More pigment means more UV protection and a longer life but less visible wood grain; less pigment shows more grain but fades sooner. Penetrating oil formulas are usually clear to semi-transparent and are applied wet-on-wet in a single pass.
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