Zinsser

B-I-N is a thin, alcohol-carried product loaded with heavy titanium dioxide, so in storage the white pigment drops to the bottom and clear amber shellac floats on top. Decorator reviews are full of people who open a tin, see amber liquid, and either assume the primer has gone bad or brush the top layer on as-is, which puts pigment-free shellac on the wall that hides nothing and smells twice as strong. Shaking a gallon does not fix it. Scoop and stir from the bottom up until the color evens out, every single time you use it.

The datasheet claims up to 500 sq ft per gallon in one coat, and the field keeps arguing. Stain blocking is excellent; hiding is the weak link. Over flat paint, bare drywall, or subfloor, one thin runny pass covers far less than the number implies. One decorator put two coats over French oak and the bleed still read through the white topcoat; another needed four coats of emulsion over B-I-N to bury a yellowed water stain on a chimney breast. On knotty or dark wood, budget the second B-I-N coat and the extra topcoats before you decide this is the cheap route.

Pros on PaintTalk are blunt about it. The recurring line is that the Cover Stain smell sticks around forever, and homeowners repeat it on Home Depot reviews. It is mineral-spirits oil chemistry, so the fumes migrate into adjacent rooms and come back when a room heats up. The other two complaints travel together: it runs easily on vertical surfaces, and it starts flashing off while you are still brushing, so laying it on smoothly takes a fast hand. Ventilate for days, not hours, and do not prime a bedroom you plan to sleep in that night.

The mold warranty is the reason to buy it, and opacity is the reason people get annoyed. Decorators report the satin needing two coats minimum, and three plus a primer over bare plaster, which is not what a self-priming claim implies. Two other reports repeat: a painter got microbubbles across a bathroom ceiling that popped as the film set up, and a Home Depot reviewer found yellow-orange streaking on bathroom walls about four weeks in. Roll it thin, let each coat flash properly, and price the job at three coats so the third one is not a surprise.

Zinsser sells 1-2-3 next to 1-2-3 Plus next to B-I-N next to B-I-N Advanced next to Cover Stain next to Gardz, and the labels do not tell you which problem each one solves. Professional forums run whole threads titled 123 vs 123 Plus, which tells you the shelf is not doing its job. The result is the most common Zinsser failure: someone buys 1-2-3 for a nicotine wall or B-I-N for torn drywall paper and blames the brand. Pick by substrate problem first, chemistry second, and the price question answers itself.

Pick by the problem, not the price. New drywall, a color change, or glossy trim: Bulls Eye 1-2-3. Bare cedar, knots, or exterior wood: Cover Stain. Smoke, pet urine, fire soot, or a deep water ring: B-I-N. Torn drywall paper or old wallpaper paste: Gardz. Laminate, tile, or PVC: BONDZ. Mold on a bathroom wall: Mold Killing Primer, then Perma-White on top.

B-I-N is the best at what a primer is hardest at, which is blocking stains and sealing odor, and nothing sold off a shelf beats it. It is not the best buy for most people. At about $75 a gallon with mediocre hiding, it is a spot sealer. The primer most households should actually buy is Bulls Eye 1-2-3 at $28 to $32, with a $25 quart of B-I-N in the garage for emergencies.

Rust-Oleum, which is owned by RPM International. Zinsser started in Brooklyn in 1849 as a shellac importer, which is where B-I-N comes from, and Rust-Oleum bought the brand in 2006. The formulas survived the acquisition mostly intact, so the cans on the 2026 shelf are recognizable to painters who learned on them in the 1990s. Rust-Oleum's name shows up on the back-label legal text.

Sealing a surface so the finish coat holds and nothing bleeds through it. That splits three ways across the line: blocking stains and odors that would ghost through paint, gripping slick surfaces like glossy trim, laminate, and tile so the topcoat cannot peel, and sealing porous or damaged substrates such as bare drywall, plaster, and torn paper. Perma-White is the exception in the line, because it is a finish coat rather than a primer.

For primers, yes, it is the strongest brand in the US aisle. For paint, it barely competes, because Perma-White is the only real finish coat Zinsser sells and it exists for mold-prone rooms rather than for color. There is no premium wall line, no trim enamel, and no color deck. Buy Zinsser for the layer underneath and shop Benjamin Moore, Sherwin-Williams, Behr, or Backdrop for the layer on top.

Cover Stain for most bare wood. It is oil-base alkyd, it penetrates the grain, and it locks tannin in cedar and redwood at $35 to $42 a gallon against about $75 for B-I-N. Step up to B-I-N only when the wood has a second problem on top of being bare, such as knot bleed that already came through a coat of Cover Stain, smoke damage on raw lumber, or an old oil finish you want to seal instead of strip.

Plus is the newer formula: zero-VOC, dry in about 30 minutes, recoat in an hour, and rated for heavier stain blocking and adhesion than plain 1-2-3. It costs a few dollars more, around $34 a gallon against $28 to $32. If the wall is clean and you just need a sealer, plain 1-2-3 is fine. If you suspect a stain but do not want to jump to B-I-N, buy Plus.

Because shellac is farmed, not synthesized. The resin comes from the lac bug in India and Thailand, roughly 100,000 insects per pound of flakes, and climate-driven crop failures tightened supply while food and pharmaceutical coatings compete for the same material. Add heavy titanium dioxide loading and an alcohol carrier and the gallon has gone from about $48 a few years ago to roughly $75 to $83 today. The quart at about $25 is the workaround.

No. Perma-White is mold-and-mildew-proof, meaning the dry film resists growth for five years under the warranty, and it has no effect on mold that is alive on the wall today. Kill it first, then prime with Zinsser Mold Killing Primer, which is EPA-registered and does kill surface growth, then topcoat with Perma-White. Skip the kill step and the mold pushes back through the film within a couple of years.

Not meaningfully. Home Depot, Lowe's, Walmart, Ace, and Amazon all carry it and none of them run a paint-brand sale calendar, and Rust-Oleum has no rebate or loyalty program on the Zinsser line. The shelf price is the real price. The only discounts that exist are size-based, and they cut both ways: the 5-gallon pail saves money per gallon, while a quart saves you from buying a gallon you will never finish.

Almost everywhere paint sells. Home Depot and Lowe's carry the deepest selection including 5-gallon pails, Walmart and Ace stock the common cans, and Amazon is competitive on a single gallon though oil-base Cover Stain can carry a shipping surcharge as a flammable liquid. Most Sherwin-Williams stores stock B-I-N and 1-2-3 as well, which says a lot about how non-negotiable those two are for pro work.

Yes, and you should. B-I-N is a sealer that happens to be white, not a finish, and it recoats in about 45 minutes with latex or oil. Two things to plan for: it yellows over months under a thin white topcoat in low-light rooms, so use two finish coats, and its hiding is weaker than the label implies, so over a dark or stained surface expect an extra coat of color rather than one.