will this remove water stains?

It worked very well on the small mold discoloration. I'd try it for water stains because of the completed coverage on the darker mold stains. Seems as opaque as would be needed....

Need to wait 2 days before applying second coat to undersink area. Is that a problem?

I do not know for sure; I used the stuff in an un-ventilated cupboard and applied 2 coats as 1/day. I do not recall anything thing that conditioned application other than to be sure that the previous coat was dry. Clearly there is some chemical reaction going on, but once dry one may imagine that the process is complete? Good luck.

Did this get rid of mold? For how long? Did the mold come back later?

Yes it did get rid of the mold. There are a couple of spots where the mold is returning but they seem to be areas that did not get as much paint but even those areas took about 6 months to return. I highly recommend this item in fact I am planning to order more for another room. T

Qt Zinsser 276087 White Zinsser Mold Killing Primer Water Based

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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Description

🛡️ Shield your space with the only primer that truly kills mold, not just hides it!

TRUSTED PROVEN - Ranked #2 in Primer Paint with 4.5-star reviews from over 4,000 users who swear by its lasting mold protection.
COVERAGE THAT WORKS - One quart covers up to 160 sq ft, making it ideal for residential, commercial, and industrial spaces.
MOLD GONE FOR GOOD - EPA-registered antimicrobial formula kills existing mold, mildew, and odor-causing bacteria without heavy pre-cleaning.
ECO SMART USER FRIENDLY - Water-based, low-odor primer that’s safe for indoor use and dries to a matte finish in just 1 hour.
VERSATILE SURFACE SOLUTION - Perfect for metal, wood, drywall, and under wall coverings—paint directly over mold without extensive prep.

Zinsser Mold Killing Primer is a water-based, EPA-registered fungicidal coating designed to kill existing mold, mildew, and odor-causing bacteria on a variety of surfaces. It offers fast drying, excellent coverage (160 sq ft per quart), and a matte finish, making it ideal for indoor use in residential, commercial, and industrial settings. Trusted by thousands, it eliminates mold without extensive pre-cleaning and prevents regrowth, ensuring a healthier, cleaner environment.

Specifications

ASIN	B00K7FEQPI
Age Range Description	Adult
Best Sellers Rank	#1,547 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #1 in Primer Paint
Brand	Zinsser
Brand Name	Zinsser
Color	White
Color Code	White
Container Type	container
Coverage	160 sq ft
Customer Reviews	4.5 out of 5 stars 4,200 Reviews
Finish Type	Matte
Full Cure Time	1 Hours
Global Trade Identification Number	00020066238032
Included Components	Primer
Indoor Outdoor Usage	Indoor
Is Waterproof	False
Item Form	Liquid
Item Type Name	Zinsser 276087 Mold Killing Primer, Quart, White
Item Volume	946.35 Milliliters
Item Weight	0.09 Kilograms
Manufacturer	RUST-OLEUM
Model Name	Zinsser Mold Killing Primer
Model Number	276087
Paint Type	Acrylic
Part Number	276087
Size	32 Fl Oz (Pack of 1)
Special Feature	Mold Killing
Special Features	Mold Killing
Specific Uses For Product	Interior/Exterior
Surface Recommendation	Metal, Wood
UPC	020066238032
Unit Count	32.0 Fluid Ounces
Warranty Description	Warranty
Water Resistance Level	Water Resistant

Reviews

M**E

9.01.2026

W**Y

20.03.2026

C**D

10.04.2026

V**E

15.03.2026

D**E

17.01.2026

P**R

2.11.2025

L**O

9.04.2026

D**I

20.03.2026

A**R

23.11.2017

K**R

27.04.2024

R**H

7.08.2016

M**M

17.06.2025

D**M

6.12.2024

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qt Zinsser 276087 White Zinsser, Mold Killing Primer Water-Based Mold Killing Primer

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