DIY Forum

 

Ultimate HandymanUltimate Handyman on Pinterest

 

DIY Forum/Home improvement advice forum

 

 

A-Z CONTENTS | DISCLAIMER | DIY VIDEO | HOME | SAFETY FIRST | FORUM RULES

It is currently Tue Oct 16, 2018 1:20 pm
Visit Hilti


Time zone: Europe/London [ DST ]




 

 


Post new topic Reply to topic  [ 6 posts ] 
Author Message
PostPosted: Mon Apr 02, 2018 8:03 pm 
Offline
Newly registered Member

Joined: Mon Apr 02, 2018 7:33 pm
Posts: 3
Has thanked: 0 times
Been thanked: 0 times
Hello - see image - these are small solid lumps not bubbles.

The wall originally had orange emulsion on lining paper, this was covered in white matt emulsion to take the colour down. When this had dried (a few days). Two layers of blue matt emulsion (Homebase own brand) were added without any problems. It needed a third coat to deal with a bit of unevenness in the coverage. That is when the spots appeared. They appear a few seconds after application. I have tried with a brush, pad, and two different types of roller, and in different parts of the room - makes no difference. The previous coats had been left to dry for about 18 hours.

Has anyone any idea why this is happening?

Thanks in advance for any help.


Attachments:
File comment: paint spots
paintspots2.jpg
paintspots2.jpg [ 63.78 KiB | Viewed 633 times ]
Share on FacebookShare on TwitterShare on DiggShare on DeliciousShare on Google+
Top
 Profile  
Reply with quote  
PostPosted: Mon Apr 02, 2018 8:27 pm 
Online
Senior Member

Joined: Thu Apr 14, 2011 7:33 pm
Posts: 3826
Location: Dundee, Scotland.
Has thanked: 729 times
Been thanked: 803 times
:welcomeuhm: Have you tried breaking one of those bubble things to see what is inside? If they just appear they cannot be something put on by your most recent coat of paint or you would see the lumps being deposited on the wall, so they are bubbles and they can be tough because they can be made by multiple layers of paint.

The chances are that one of the previous coats of paint has not adhered well. It could be because the wall was dirty or contaminated with who knows what, or the paint was cheap cheap sh1te that could not stick on anything. Anyhoo, a subsequent coat of paint hydrates the paint already on teh wall and where there is a weakness you get a bubble. If you scrape a couple of the bigger bubbles you will see what you got underneath ... it could be the wallpaper, or the orange paint or the white paint or one of your blue coats. All the bubbles are near the seam so it might be old adhesive that was on the wall paper.

You need to improve your technique and use a medium pile roller sleeve (Hamiltons perfection range). Your painting shows too many short strokes and uneven orange peel. A good sleeve would allow you to carry more paint and get a more even coverage with at least an even orange peel. You still need another 1 or 2 coats of paint given the shade I see in your photo.

The only cure there is to scrape off the lumps and sand them down. There is a danger they will reappear when you apply another coat of paint in which case you have to consider using Zinsser Peel-Stop

PS. I had your problem over unprimed porous fillers. What is white paint you used and was it new paint?

Other than that we will all say in one voice "retail paints suck" :wav:


Top
 Profile  
Reply with quote  
PostPosted: Mon Apr 02, 2018 9:38 pm 
Offline
Newly registered Member

Joined: Mon Apr 02, 2018 7:33 pm
Posts: 3
Has thanked: 0 times
Been thanked: 0 times
OchAye wrote:
:welcomeuhm: Have you tried breaking one of those bubble things to see what is inside? If they just appear they cannot be something put on by your most recent coat of paint or you would see the lumps being deposited on the wall, so they are bubbles and they can be tough because they can be made by multiple layers of paint.

The chances are that one of the previous coats of paint has not adhered well. It could be because the wall was dirty or contaminated with who knows what, or the paint was cheap cheap sh1te that could not stick on anything. Anyhoo, a subsequent coat of paint hydrates the paint already on teh wall and where there is a weakness you get a bubble. If you scrape a couple of the bigger bubbles you will see what you got underneath ... it could be the wallpaper, or the orange paint or the white paint or one of your blue coats. All the bubbles are near the seam so it might be old adhesive that was on the wall paper.

You need to improve your technique and use a medium pile roller sleeve (Hamiltons perfection range). Your painting shows too many short strokes and uneven orange peel. A good sleeve would allow you to carry more paint and get a more even coverage with at least an even orange peel. You still need another 1 or 2 coats of paint given the shade I see in your photo.

The only cure there is to scrape off the lumps and sand them down. There is a danger they will reappear when you apply another coat of paint in which case you have to consider using http://www.zinsseruk.com/product/peel-stop/

PS. I had your problem over unprimed porous fillers. What is white paint you used and was it new paint?

Other than that we will all say in one voice "retail paints suck" :wav:


Hello, thanks for replying. The coverage in the picture is a bit sh1te because I'd already had a scrape and a wipe of some of the previous spots, added a bit more paint, wiped that away etc - so wiped away a bit of the other coats. The photo also shows the blue as a lot lighter than it really is. Other bits of the room have more even coverage, are in the middle of the paper, and some of the spots appear as I'm painting, most appear after about 15-30 seconds. When I've scraped them off the white emulsion appears. The last sleeve I used was a Harris 'Tiger Stripe'. The white paint was new matt emulsion.


Top
 Profile  
Reply with quote  
PostPosted: Mon Apr 02, 2018 10:02 pm 
Online
Senior Member

Joined: Thu Apr 14, 2011 7:33 pm
Posts: 3826
Location: Dundee, Scotland.
Has thanked: 729 times
Been thanked: 803 times
Sometimes, bubbles like this shrink back .... maybe let them dry first. It sounds like you will need the zinsser stuff I mentioned above or a lot of scrapping and sanding which is not ideal over lining paper.

PS. Does the white paint stay on the wall or does it come off with the bubbles? Do you see orange underneath it?


Top
 Profile  
Reply with quote  
PostPosted: Mon Apr 02, 2018 10:40 pm 
Offline
Newly registered Member

Joined: Mon Apr 02, 2018 7:33 pm
Posts: 3
Has thanked: 0 times
Been thanked: 0 times
OchAye wrote:
Sometimes, bubbles like this shrink back .... maybe let them dry first. It sounds like you will need the zinsser stuff I mentioned above or a lot of scrapping and sanding which is not ideal over lining paper.

PS. Does the white paint stay on the wall or does it come off with the bubbles? Do you see orange underneath it?


The white stays on. The bubbles are still there after about 8 hours, so I don't think they're going away of their own accord! I pressed a few with my finger and they almost disappeared so you barely see them, but I don't fancy doing that with a whole room :-)

Maybe I'll just stick a load of pictures up to hide it. It's in my bedroom, so doesn't really get visitors :-p


Top
 Profile  
Reply with quote  
PostPosted: Tue Apr 03, 2018 6:31 pm 
Offline
Senior Member
User avatar

Joined: Sat Jan 10, 2009 3:49 pm
Posts: 23924
Location: hants/dorset border
Has thanked: 1485 times
Been thanked: 3791 times
Was the emulsion thoroughly stirred before application ?

_________________
Verwood Handyman

Verwood Handyman


___________________________________________________________________

If you feel you have benefited from the Free advice given on the Forum, Please consider making a donation to UHM's Nominated charity, read all about it and donate here :

http://www.donnasdreamhouse.co.uk/


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 6 posts ] 

 

 




Similar topics
   

Time zone: Europe/London [ DST ]


Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Visit Solent plastics


 

 

 

News News Site map Site map SitemapIndex SitemapIndex RSS Feed RSS Feed Channel list Channel list
ultimatehandyman privacy policy

Contact

 

Powered by phpBB® Forum Software © phpBB Group

phpBB SEO