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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Zinsser & 276087 QT Mold Killing Primer - Quantity 1

Zinsser & 276087 QT Mold Killing Primer - Quantity 1

Product ID: 171057632

Details

Brand
Zinsser
Colour
white
Finish Type
Matte
Item Volume
946.35
Size
1

💧Water-resistant for lasting protection

🕒Dries in just 4 hours

🦠Kills mold & mildew effectively

₩172314

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Sold byAmazon South KoreaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛡️ Prime your space, kill the mold, and stay ahead of the decay!

MOLD ANNIHILATOR - Eliminates mold, mildew, and odor-causing bacteria for a healthier space
FAST TRACK FINISH - Matte finish dries in 4 hours with full cure in just 1 hour—get back to living faster
DUAL SURFACE POWER - Bonds seamlessly to siding, masonry, metal, and wood—indoor or outdoor
WATER RESISTANT SHIELD - Protects surfaces from moisture damage, extending the life of your paint job
EPA REGISTERED ASSURANCE - Trusted, safe, and compliant for peace of mind in every coat

Zinsser 276087 QT Mold Killing Primer is a water-based, EPA-registered primer designed to kill existing mold, mildew, and odor-causing bacteria. Suitable for both interior and exterior use, it bonds to multiple surfaces including metal, wood, masonry, and siding. With a quick 4-hour dry time and water-resistant properties, it ensures durable protection and a smooth matte finish, making it a top choice for professional-grade home improvement.

Specifications

ASIN	B00K7FEQPI
Age Range Description	Adult
Best Sellers Rank	#22,952 in Home Improvement ( See Top 100 in Home Improvement ) #17 in Primer Paint
Brand Name	Zinsser
Color Code	#FFFFFF
Colour	white
Container Type	Tin
Country of Origin	USA
Coverage	Medium
Customer Reviews	4.5 4.5 out of 5 stars (3,210)
Dry Time In Hours	4
Finish Type	Matte
Full Cure Time	1 Hours
Global Trade Identification Number	00020066238032
Included Components	Primer
Indoor Outdoor Usage	Indoor
Is Waterproof	True
Item Form	Liquid
Item Type Name	paint
Item Volume	946.35 Millilitres
Item Weight	0.09 Kilograms
Manufacturer	0
Model Name	Zinsser Primer para matar mofo
Model Number	276087
Paint Type	Water-based
Part Number	276087
Size	1
Special Features	Mold Killing
Specific Uses For Product	Interior/Exterior
Surface Recommendation	Metal, Wood
UPC	020066238032
Unit Count	32 Fluid Ounces
Water Resistance Level	Water Resistant

Common Questions

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Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

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How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Anjali K.

The product quality is outstanding. Exactly what I needed for my work.

1 month ago

Suresh K.

Very impressed with the quality and fast delivery. Will shop here again.

4 days ago

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₩172314

Duties & taxes included

In stock

Sold byAmazon South KoreaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to South Korea.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

Yusuf A.

Fantastic experience overall. Will recommend to friends and family.

1 month ago

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