I doubt if the paint could hod up to being soaked in water. The use porcelain paint for tubs.

Zinsser Mold Killing Primer

It has been 9 months and the mold has not returned.

Yes, you need to apply a coat of paint over the top of this primer.

Sure. The manufacture states this product is great for under wallcovering.

Product ID: 22367741

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Brand	Rust-Oleum
Color	White
Finish Type	Matte
Size	128 Fl Oz (Pack of 1)
Item Volume	128 Fluid Ounces
Unit Count	128 Fluid Ounces
Paint Type	Water Based
Specific Uses For Product	Interior
Surface Recommendation	Interior and Exterior Surfaces
Item Form	Liquid
Age Range (Description)	Adult
Is Waterproof	False
Package Information	Pail
Color Code	#FFFFFF
Full Cure Time	1 Hours
Coverage	350 sq ft/gallon
Water Resistance Level	Not Water Resistant
UPC	020066237912
Global Trade Identification Number	00020066237912
Part Number	276049
Item Weight	9.98 pounds
Product Dimensions	13.6 x 7.1 x 8 inches
Item model number	276049
Is Discontinued By Manufacturer	No
Finish	Matte
Item Package Quantity	1
Batteries Included?	No
Batteries Required?	No