I'm after some advice about a problem in the bedroom (not of a Deleted nature, I hasten to add!)
The previous owner of our house rather unwisely turned the fourth bedroom into an en-suite, with just an open arch through into the main bedroom.
As a result, we have had a recurrent problem with condensation and paint problems which we can't seem to get rid of, despite fitting an extractor fan.
We redecoratated a few years back, but the black mould keeps coming back, but more worringly, we have recently seen that the paint has blistered and bubbled in places. This isn't what I would expect when paint gets damp and flakes off, it is more like a chemical reaction in the paint. The bubbling is solid with nasty brown and yellow stains around it.
At the weekend I attacked the black mould with HG Mould Spray which worked superbly, not a sign of it left, but the bubbling spots don't really look mouldy so I am not sure if this is the same or something different.
I then stripped off all the paint around the worst areas of bubbling and it is clear that the plaster is dampest in that area as it was significantly darker there than elsewhere. The darkest parts of the plaster were were the paint had bubbled the worst.
I assume that this is all down to condensation but it is hard to be certain. We are going to try to put up a curtain against the arch to the en-suite to keep as much of the moisture in there, but not sure how to tackle the damp plaster?
I'm tempted to leave it a few weeks to see it it dries out, then redecorate. I've seen some anti-mould and anti-condensation paints so these might be worth a try, but I don't really want to redecorate the whole bedroom if I don't have to as the rest is fine and we have a pot of the original paint left over to colour match. The ideal would be an effective anti-damp primer covered in our original paint, but not sure if this would be possible?
I'm not really much good at diy but money is tight so I want to tackle the problem myself if possible. Any advice or opinions on the problem and how to deal with it would be very welcome!!