Paint reaction?

[ren385]

Hi all,

Please see attached photos,

I am trying and find out the cause of this if anyone can help please?

This wall has recently been papered and then painted in a Dulux grey Matt paint,

In one corner it looks as though it has reacted?

I have tried to re-paint over the marks but they re-appear,

There was no paint underneath and the grey was the first and only colour to go on top of the wallpaper,

Thanks

 

[sparkwright]

Hard to say what's causing it.

Something bleeding through from the plaster, or maybe glue residue from the paper.

If it's a stain bleeding through from the plaster, you could try some oil-based undercoat, or stain block, over the paper, then emulsion - and hope for the best.