Semi-Solid Deck & Siding StainCabot paint review

Why it happens. A penetrating semi-solid should not peel at all, so when it does, one of three things happened. Something film-forming was left underneath — old paint, old solid stain, or a clear sealer — and the stain bonded to that film instead of to wood. Or the boards were still wet when you stained, and moisture trapped above roughly 20 percent pushed the coat back off the first time the sun hit it. Or it was over-applied on dense smooth boards, where the excess that could not soak in sat on the surface as a thin film, and that thin film is the only part of the job that can peel.

The fix. Strip the failed areas back to bare wood. Let the boards dry until they pass a check — sprinkle water on a board, and if it soaks in within a few seconds you are good, if it beads and sits the wood is still full. A moisture meter is better. Then recoat thin. Do not spot-patch over a peeling edge; it keeps walking outward.

Why it happens. The one-coat line on the label is a fairy tale on rough wood. On smooth, dense, prepped boards it is real — a hands-on test by Bob Vila got genuine one-coat coverage and water still beading at three weeks. On rough-sawn cedar, weathered PT pine, or anything thirsty, the first coat disappears into the grain unevenly. Honest coverage there is 250 to 350 sq ft a gallon, not 500.

The fix. Set your expectation off your boards, not off the can. Smooth and dense: buy for one coat, apply thin, do not flood it. Rough or gray: buy for two and plan the second-day return. For a 300-square-foot deck on rough boards, buy three gallons, not two.

Why it happens. Fresh-milled lumber comes off the planer with a burnished mill glaze that sheds stain. It looks like clean bare wood, so people skip straight to the can and then blame the product when the oil sits on top and never soaks in.

The fix. Break the glaze with a pass of 80-grit before you stain. That opens the surface so the oil can get in. On weathered boards you are washing with a deck cleaner instead, then following with a wood brightener — the brightener is not cosmetics, it drops the pH back down after the cleaner and reopens the grain.

Why it happens. This is a deck stain doing deck-stain things. Flat boards that pool water after rain and the foot of a stair stringer take the beating. On a deck with bad drainage the high-traffic lanes thin out while the edges still look new. South-facing boards fade and thin first.

The fix. Recoat the worn runs in year three, not the whole deck and not a full strip. Because the stain soaks in and wears by thinning out, a clean and a fresh coat over the worn spots blends. Expect a year-old coat to read a touch lighter than fresh, so pull the recoat out to a natural break like a board end.

Why it happens. Stopping mid-board. The oil has a long open time and holds a wet edge well, but the leading edge still sets eventually, and a restart in the middle of a board reads as a line the moment low sun hits it. Spraying without back-brushing does the same thing — sprayed stain that is not worked in just sits on top.

The fix. Cut in the rail and board ends first, then pull full boards end to end, two to three boards at a time. Never stop mid-board — stop at a board end every time. Natural-bristle brush, a stain pad, or a sprayer with immediate back-brushing behind the gun, no exceptions.

If your boards are already gray and blotchy, yes. Semi-solid carries about twice the pigment and hides roughly 70 percent of the grain, so it covers old weathering that a semi-transparent only tints. On new or clean cedar where you want the grain to show, skip it and run a semi-transparent instead. Buy by how tired the wood looks, not by the can.

No, and do not use one. It is self-sealing and it has to soak into bare or stripped wood to grip. Nothing film-forming can be underneath it. Old paint, old solid stain, or a clear sealer blocks the bite and the coat wicks off in the first hard rain.

Three to four years on horizontal deck boards, longer on vertical fence and siding that do not take foot traffic or standing water. That is an honest number for a semi-solid. South-facing boards and stair treads go first. Plan a clean-and-recoat on the high-wear runs in year three, not a full strip.

The standard Semi-Solid Stain + Sealer #1400 is oil-based alkyd and cleans up with mineral spirits. Two water-cleanup siblings exist. The Low VOC #17400 is a waterborne alkyd sold where the oil can is restricted, and Semi-Solid Acrylic Siding Stain is a separate 100 percent acrylic product meant for siding, shingles, and log homes. If you are staining a deck and your state allows it, the oil #1400 is the one to buy.

The standard #1400 is oil-based, cleans with mineral spirits, and covers 400 to 500 sq ft a gallon on smooth wood. The Low VOC #17400 is a waterborne alkyd under 250 g/L for California and the OTC states, cleans with soapy water, and covers only 250 to 350 because it carries less oil. Both hide the same. Buy the oil if your state allows it.

No. Semi-solid stain is meant to soak in, and a painted board has a film on top that blocks it. It will sit on the paint, dry funny, and peel. For a previously painted deck you want a solid-color stain or a deck coating built to bond to a film. Strip the paint off first if you want to use this product.

A penetrating semi-solid peels for three reasons. Something film-forming was left underneath, the wood was still wet when you stained it, or it was over-applied on dense smooth boards and sat on top instead of soaking in. Moisture trapped above roughly 20 percent pushes a fresh coat back off after rain. Strip the failed areas to bare wood, dry the boards until they pass a water-drop check, and recoat thin.

Between 50 and 90 degrees F, and that means both the air and the board surface. A sun-baked south-facing deck can run 30 degrees above the air temperature, so put your hand on the boards before you start. Keep the deck in that range and rain-free for about 24 hours after you finish so the oil sets before weather hits it.

Depends on your boards, not on the can. On smooth, dense, prepped wood one coat is real — a hands-on test found genuine one-coat coverage with water still beading at three weeks. On rough-sawn cedar or thirsty weathered PT pine the first coat soaks in uneven and leaves hungry spots. Buy for two coats there, and figure 250 to 350 sq ft a gallon instead of 500.

Yes. Samuel Cabot founded the company in 1877, Valspar bought Samuel Cabot Inc. in 2005, and Sherwin-Williams acquired Valspar in June 2017, taking Cabot with it. Sherwin-Williams keeps Cabot as its stain brand for the Lowe's channel, with formulas kept separate from the SuperDeck line sold in its own stores.