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

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Mold Killing Primer, Quart | Zinsser Mold Killing Primer, Quart. Antimicrobial primer kills & blocks mold, mildew & odor-causing bacteria on interior.

Product ID: 14350658

Details

Brand
Zinsser
Color
White
Finish Type
Matte
Item Volume
946.35 ml
Paint Type
Acrylic
Size
32 Fl Oz (Pack

💧Water-based, eco-friendly formula

🦠Kills mold & mildew effectively

⏱️Fast 1-hour dry & cure time

B/.96

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Sold byAmazon PanamaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛡️ Defend your space with the mold-fighting primer pros trust!

RAPID DRY CURE - Ready to topcoat in just 1 hour—get your project done faster and flawless.
STAIN COVERING POWER - Conceals stubborn fungal stains for a fresh, clean finish every time.
EPA REGISTERED ASSURANCE - Backed by EPA registration for trusted antimicrobial performance and quality.
VERSATILE SURFACE SHIELD - Works seamlessly indoors and outdoors on metal, walls, and under coverings.
MOLD MILDEW ANNIHILATOR - Paint directly over mold without tedious prep—save time and skip the hassle.

Zinsser Mold Killing Primer is a water-based, EPA-registered fungicidal coating designed to kill existing mold, mildew, and odor-causing bacteria. It allows painting directly over moldy surfaces without extensive cleaning, covers fungal stains, and dries in just one hour. Ideal for residential, commercial, and industrial use on a variety of surfaces including metal and walls, it offers a reliable, fast-acting solution to protect and refresh your space.

Specifications

ASIN	B00K7FEQPI
Age Range Description	Adult
Best Sellers Rank	#2,113 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #2 in Primer Paint
Brand Name	Zinsser
Color	White
Color Code	White
Container Type	container
Coverage	160 sq ft
Customer Reviews	4.5 4.5 out of 5 stars (4,465)
Dry Time In Hours	1
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 ml
Item Weight	0.09 kg
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 Features	Mold Killing
Specific Uses For Product	Interior/Exterior
Surface Recommendation	Metal
UPC	020066238032
Unit Count	32 Fluid Ounces
Warranty Description	Warranty
Water Resistance Level	Water Resistant

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