Bathroom paint blistering

[ldoodle]

Hiya,

We done stripped out our bathroom in June, which included both hardwalling and plastering everywhere. We then painted with Crown's Kitchen and Bathroom paint but in some places (although small) it's started to blister when having a shower.

We do have an extractor fan which go striaght outside (rather than into the ceiling), but the only way we can stop it is having the window open, which during winter isn't great when you've got the CH on!

Any ideas why this has happened, and is it best to strip off where it's blistering, patch and re-paint?

Interestingly this has also happend in our lounge, although directly behind the radiator so assumed it was this, but now wondering if it's more sinister?

 

[Maxsys]

Did you apply a mist coat first?

 

[misterhelpful]

As Maxsys implies, if there was no mist coat on bare plaster then steam and condensation will cause the paint to lift very easily. Excess moisture is the main cause of paint lifting in the bathrooms.

If you dry washing on the radiator where the blister occurs then this makes it more likely that moisture is the culprit causing the paint to blister.

You can scrape the paint off, mist coat any bare plaster, face fill and sand to blend in, then dust off and re-mist the filler before applying the finishing paint. Be warned that if there is no existing mist coat you may end up scraping quite a lot (if not all ) of the paint off as, in this situation, it often peels easily.

 

[ldoodle]

Thanks guys.

I can honestly say that I did do a mist coat first (I always do on fresh plaster).

It's also not by the towel rail, not near any heat source in fact. It's 2 very small sections (about the size of a thumbnail, maybe slightly bigger) inbetween the shower screen and window.

We do have extraction which we almost always use when having a shower. It's funny as this has only just started happening and the bathroom was done in May/June.

 

[RonnySanders]

Paint begins to peel and puff up from the surface, forming small to large surface bumps that look like blisters. This occurs when painted walls or ceilings have a constant exposure to high humidity.