ᐅ Non-woven wallpaper adhesive shows a pink stain through the wallpaper.

Hello dear community,
we are at our wit’s end and hope for your advice. We are currently renovating a single-family house built in 1935. In the living room, we hung non-woven wallpaper using Metylan “direct control” paste. Before that, the wall was primed with a mixture of primer and white wall paint. After wallpapering, we noticed that in some areas the pink indicator of the paste (which is supposed to dry clear) is showing through in the shape of water stains. Now we have pink spots under our wallpaper. The wallpaper was hung 4 days ago(!), and we don’t feel the stains have visibly changed or gotten smaller since then. We called the Metylan hotline, and they said it might still be drying?

Has anyone experienced this problem and can tell me if the pink color will still turn clear, and if so, how long it takes? We are moving in 10 days (not flexible due to a very advanced pregnancy), and I’m slowly getting used to the terrible idea of having to paint over my $300 wallpaper.

THANK YOU!

Hello,

First of all, a question: Why was the wall primed with a diluted deep primer mixed with dispersion paint? In other words, this most likely eliminated the wall’s absorbency; the wall is sealed (deep primer reduces absorbency, that’s its purpose, and dispersion paint is sealed because of its plastic film). Now, a non-breathable fleece wallpaper, which is also plastic-based, is applied on top of the sealed wall.

The paste and the mixing water have no way to evaporate. So the paste is probably still wet and will soon develop mold.

There are two options now:

1. Remove the wallpaper, sand the wall to restore absorbency, and then prime again with a tinted wallpaper primer.

or

2. Remove the wallpaper and use paper wallpaper, which at least allows the mixing water to evaporate forward. However, this option is not guaranteed.

I hope this helps.

Best regards