Rust-Oleum Zinsser 287512 Molding Blocking Spray Primer, 13 oz, White

I didn’t even know this product existed until a customer told me about it back when I worked at Wally World. They were dealing with a major mold problem in their home, and every time they used Kilz, the mold came right back. After doing their research, they found this primer — the only one marketed as a true mold‑killing primer instead of just a mold‑resistant one. That stuck with me. Since then, I’ve used it myself several times, and it’s been consistently effective. Real‑world results: - Warehouse drywall: We had constant mold issues from dampness. We painted the affected areas with this primer — no topcoat, just two coats of the primer — and it stayed clean the entire time I worked there. (And honestly, the coworker who applied it didn’t even clean the walls first, which is not recommended, but it still worked.) - Flood‑prone basement: Even after cutting the drywall higher to avoid water contact, the leftover dampness kept causing mold. I used this primer on the walls, and the mold didn’t return while I lived there. - New house with vent moisture issues: One storage room had a massive mold patch on the wall. I cleaned it as well as I could — not perfectly — then painted it with this primer. Months later, the mold still hasn’t come back. Bottom line: If you’re dealing with mold and you’re not confident you can remove every last trace before painting, this primer is absolutely worth it. It saves time, reduces stress, and actually kills what’s there instead of just hoping it won’t return.

Strong smell but it did the job. It dries quickly and has helped stop a mold issue. The white color looks nice but you can also paint over it. It’s a good quality and a little goes a long way. The paint is thicker so it had great coverage and does what it’s supposed to!

Good primer for mold prevention. Used many times in the past. Perfect size only needed a quart , typical stores like Home Depot did not have in stock.

Used almost the whole can for my small bathroom. Good coverage. Painted the ceiling a week ago will update if mold grows on it. It is quite pricey

A little thin but I’m guessing it’s because of the mold killer. Covered great and no more mold smell. If I run into more mold I’ll definitely buy this again.

Very good product . Goes on well highly recommend

Nice paint but I wish it was a bigger can. Pic included

A great buy if using in the basement or anywhere with a moisture/humidity issue.