Corner bead in plaster showing through paint

[bezzas]

Hi All,

Our house has just been built, plaster has been set for about 6 months now and has the standard magnolia paint on it.

Around the windows where metal corner beads have been used to form the proper corner of the wall have been plastered over and and all looks fine with the magnolia paint.

As soon as we paint with a light blue for example the pattern of the metal bead shows through the paint. Not the actual bead its self just like a lighter showow sort of effect.

Any ideas how to stop this?

Thanks

Andy

 

[diyisfree]

Do you mean like the pattern of the mesh beeding ?

In other words, the plaster has kind of sagged and its leaving an imprint of the beeding under theplaster ?

 

[bezzas]

Hi,

Thanks for the reply.

Not a pattern but a shadow.

Basically it feels smooth just the look of the metal pattern is showing through is a lighter colour than the paint on the wall.

Kinda hard to explain.

 

[noseall]

this may be due to the bead not having much plaster coverage.

if the bead happened to be splayed too much it may result in very little room for skim being applied on top of the bead.

this in turn would mean the area where the bead sits would have a lower suction than the rest of the wall.

this could result in a visible 'shadow' or mean that the colour of the paint may appear less solid.

 

[bezzas]

How could this be resolved?
With some oil based undercoat?

 

[noseall]

ask those wise folks in the d&p section.

 

[Stevey]

Is it diamond pattern that you talk of?

 

[roughcaster]

I'm thinking what your thinking Stevey.I don't think this is the pattern of a mesh bead, rather the bigger diamond pattern of a thin coat bead. As Noseall said earlier, the metal of the bead would have no suction at all, whereas the wall surrounding the bead would have suction, as a result, the plaster covering the bead pattern would be softer for longer,and probably when the "wall" plaster was set, the plaster over the bead diamond pattern was not quite set, but left by the plasterer as a finished job, leaving the slight indented shadow....... TRY THIS....This is what I would do. If you get a drop of READY MIX joint finish, and skim a thin coat,with a good flexible scraper over the beads in question, 2 or 3 inches out from the edge of the bead,feathering the edges as you go. Put it on as smoothly as you can, but don't play with it. Let it dry and then give it another thin coat the day after,again feathering the edges. When it has all dried out,sand it down lightly(up and down the way) with an"OLD"piece of FINE sandpaper,with just enough roughness to sand it,but not tear it, feather away gently to nothing at the edges. Put the roller over it a couple of times and that will sort that out.


Roughcaster.

 

[bezzas]

Not a diamond shape, wierd shapes and sizes but all in the width of the corner bead.

Its not consistant, thers a patch of light shadow then its fine for a bit then some more light patches.

There is no indenting the corners and wall parts are perfectly smooth with no lumps or bumps.

would apply a bit of oil based undercoat help first then coat with the emultion again?

 

[IJWS15]

Oddly enough my daughter has the same problem but only in her bathroom.

It is a dry lining bead punched from sheet rather than the expanded type and you can see the bead shape. 2 coats of emulsion several days apart did not cover it!

 

[clout stench]

Try stain blocker then emulsion as usual.

 

[bezzas]

A coat of oil based undercoat first then the emulsion solved the problem.

thanks