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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Description

🛠️ Seal out mold, speed up your project, and stay fresh with every spray!

FAST DRY EFFICIENCY - Touch dry in just 5 minutes and ready for recoating within 30 minutes—perfect for tight project timelines.
LOW ODOR WATER BASED - Clean, safe application with easy soap-and-water cleanup—no harsh fumes to disrupt your workspace.
MOLD MILDEW BLOCKER - EPA-registered formula stops mold, mildew, and odor-causing bacteria before they start.
PERFECT UNDERCOAT PARTNER - Works seamlessly under any topcoat, especially Zinsser Perma-White, for a flawless, long-lasting finish.
VERSATILE SURFACE COMPATIBILITY - Ideal for masonry, metal, and chalky siding—preps and protects a variety of indoor surfaces flawlessly.

Rust-Oleum Zinsser 287512 Molding Blocking Spray Primer is a 13 oz. EPA-registered, water-based, low-odor primer that blocks mold, mildew, and odor-causing bacteria. It dries quickly (5 minutes to touch), covers 8-10 sq. ft., and works on multiple indoor surfaces like masonry and metal. Designed for easy cleanup and optimal undercoat performance, it’s the smart choice for professionals seeking fast, effective mold protection.

Specifications

Brand	Zinsser
Color	White
Finish Type	Matte
Size	13 Ounce (Pack of 1)
Item Volume	13 Fluid Ounces
Special Feature	Mold Killing, Odor Resistant
Unit Count	13.0 Ounce
Paint Type	Spray
Specific Uses For Product	Interior
Surface Recommendation	Masonry,Metal
Indoor/Outdoor Usage	Indoor
Item Form	Aerosol
Included Components	Mold Killing Primer
Is Waterproof	False
Model Name	Zinsser Molding Killing Primer
Package Information	Can
Color Code	000000
Full Cure Time	3E+1 Minutes
Coverage	8-10 sq. ft.
Water Resistance Level	Not Water Resistant
UPC	020066295189
Manufacturer	Rust-Oleum
Part Number	287512
Item Weight	1 pounds
Product Dimensions	2.63 x 2.63 x 7.88 inches
Item model number	287512
Finish	Matte
Material	Plastic
Item Package Quantity	1
Special Features	Mold Killing, Odor Resistant
Batteries Included?	No
Batteries Required?	No
Warranty Description	Warranty

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