Marks Coming Through Wallpaper

MRSTITTLEMOUSE

We had a damp course done 6 months ago,and wallpapered with a vinyl wallpaper a month ago.We have noticed a few bluish marks coming through the wallpaper.It is,nt damp ,the wall is solid and the other wall that had the damp course was tiled so i dont know about that one.It is only coming up as far as the new plaster was put on.Can anyone suggest what may be gonig on.Thanks.

misgrace

When you have major plastering work done, you shouldnt put vinyl wallpaper or vinyl paint on the new plaster till after six months, as it has to dry from the inside out, and vinly paper is a material, that supresses the damp/water in the plaster, and doesnt allow it to breath
With a skim plaster its different, its either that, or the problem maybe be coming thru again, and you might have to get them back again.

My friend did this, I told her not to paint the walls with Vinyl paint, she lasted about 4 months then painted, a few weeks down the line you could see patches coming through.

benood

Could it be condensation? Is the wall a cavity wall - if it is then prob not. Condensation could be blowing salts out of the plaster causing the blueish patches. Have you spoken to the people who did the work?

Mikeyorks

I had a similar problem with an internal injected DPC. Whoever did it should have put a coat of waterproofed mortar under the plaster in order to inhibit efflorescence occuring (salts leeching out) on the new plaster.

It tends to attack vinyl paper in particular and discolour it and make it brittle eventually. You've probably papered too quickly. But I found the only solution was to remove the paper - clean the plaster with a dilute acid - and then apply several coats of alkaline resistant primer e.g :-

http://www.nwepaints.co.uk/acatalog/PrimersStabalisers.html

Seemed to be working - but sold the house a few months afterwards! And as the new owners demolished that wall - I'll never know.

MRSTITTLEMOUSE

Thanks for the help everyone,the wall was plastered with waterproofed morter,so I guess it maybe that I have papered the wall too quickly.Im going to strip back that particular wall and if nothing untoward shows up let it dry fo a while then repaint the whole wall with the stuff one of you suggested,before redecorating it.We moved here six months ago,an old victorian house and ripped the place apart.We have put up over 100 rolls of wallpaper in total so I guess one more roll is'nt gong to hurt,though I had hoped I would'nt need to see another roll of the damned stuff for a few years.

Mikeyorks

Trust the vinyl is the 'easy strip' stuff? I thought mine was until I had to take it off .. when even the steam stripper just turned it into a gooey mess and it had to be pulled off an inch or two at a time.

Well worth investing in one of these perforators (used gently) if you ever need to get difficult vinyl / painted wallpaper off :-

http://www.toolstation.com/search.html?searchstr=perforator

Peartree

Totally sympathise on stripping/wallpapering fatigue! Worry that readers may think I'm on commission here, but I'm not...... If you would consider painting over the paper, can I suggest that you contact the technical/customer services department of one of the paint manufacturers used by the trade? After a recommendation some years ago, I always use Johnstones paints (and believe me I have spent many, many years of my life painting if you add it up!).

If you speak to the technical services department they would tell you if a paint finish over the paper would work or not in covering the problem. Repeating myself from another post, a quick conversation there saved me hours of time and money on a project!

There will be a trade centre for Johnstones and others in your town or, I'm sure, a quick google would find the number.

Good luck!

Peartree

Mikeyorks

Peartree wrote:

If you would consider painting over the paper ...

Trust you've misread it? I sincerely hope no one would consider painting over vinyl paper! A recipe for a real mess.

nalyo

Just a point Id raise, I papered my bathroom and did a damn good job, few days on...small patchs started to appear, I had to take all the paper down. There was a problem with the paste mixture, I used an old bucket from graden and Im sure there was something left inside that had lead to mould growth etc?? so this may be the problem??

MRSTITTLEMOUSE

Just an update to my marks coming through the wallpaper.I have taken the paper off the wall.You may recall we had damp course done 6 months ago,papered a month back and marks stated coming through acouple of weeks back on that wall only.
Well to be honest I was terrified the damp course had failed ,but what I found made want to kick myself.
I had sealed the new plaster with a strong PVA solution about a month before papering,when I took the paper off the wall was covered in bluey grey mould on the damp course area where the new plaster was, except where the paper had pulled off the pva as well.It turns out the mould was in between the pva adhesive sealer and the vinyl wallpaper.The new plaster on the damp course is good as new.
Im now trying to scrape off the remaining PVA,it is coming away but I wondered if anyone knows of anything that might remove it easier than scraping.
I can't believe how stupid I was to not realise that the PVA was waterproof and that it would'nt allow the moisture from the paste to escape,but I 've never had the need to use it before.Once again thankyou for all the help and suggestions.

misgrace

Mikeyorks wrote:

It tends to attack vinyl paper in particular and discolour it and make it brittle eventually. You've probably papered too quickly. But I found the only solution was to remove the paper - clean the plaster with a dilute acid - and then apply several coats of alkaline resistant primer e.g :-QUOTE]


I agree, its excellent stuff, nothing get through it, I use it a good bit in my jobs.

Mrs tittlemouse, now you mentioned the dreaded PVA in your previous post, I know now what the problem is.:eek:

You should never PVA a new plastered wall prior to painting or papering, if anyone tells you different then they are wrong.
Trust me, I have been a decorator for many years, and its a myth.

Plasterers use it of course in thier plastering etc, but decorators never uses it.