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

ASIN	B00K7FEQPI
Best Sellers Rank	#2,348 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #4 in Primer Paint
Brand	Zinsser
Brand Name	Zinsser
Color	white
Color Code	#FFFFFF
Colour	white
Container Type	Pail
Coverage	100-112.5 sq. ft.
Customer Reviews	4.5 out of 5 stars 2,979 Reviews
Dry Time In Hours	4
Finish Type	Matte
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 Volume	946.35 Milliliters
Item Weight	0.09 Kilograms
Item volume	946.35 Milliliters
Model Name	Zinsser 276087 Mold Killing Primer, Quart, White
Model Number	276087
Paint Type	Acrylic
Part Number	276087
Size	Quart
Special Features	Kills mould and mildew
Special features	Kills mould and mildew
Specific Uses For Product	Interior
Surface Recommendation	Metal, Wood
UPC	020066238032
Unit Count	32 Fluid Ounces
Water Resistance Level	Water Resistant

Rust-Oleum ZINSSER 276087 Mold Killing Primer Quart

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