[sayluv]

Hi-

Our place was built in 2011 (Chicago). I have noticed in one corner of our second bedroom the the paint appears to be darkening. It is difficult to tell but it appears maybe that it is where a brush was used vertically to paint the very corner where the roller could not reach. My wife is worried that there is a leak in the wall or some type of moisture causing this. There is no bubbling or water stain marks of any kind.

Does anyone have any ideas what this might be? Could it be where joint tape was used perhaps or anything else? I hope there is a leak in the wall.

I attached a few pics.

The paint is Benjamin Moore
Revere Pewter
System: BM
Color # HC-172
QT Regal Int Flat PA BS




Thanks, sl

 

[sayluv]

pictures are sideways for some reason.

 

[Gymschu]

No leak. Just a corner where a brush was used causing a lap mark which creates a shadow effect. Next time try using a 4" Whizz roller to do corners. It has the tapered end which allows you to get into corners with the roller and eliminates the need for a brush in the corner.

 

[sayluv]

thanks.

 

[Nestor_Kelebay]

My guess would be that the paint wasn't thoroughly mixed in the can.

They probably had the paint shaken, but then they may have left it for a week or two before using it. When you let a can of paint sit for a while the pigments in it will gradually settle to the bottom of the can. Even if you stir the paint, it's hard to break up that stratification of more pigment near the bottom of the can. They probably stirred the paint until they thought it was uniformy mixed, but it wasn't.

Then, when they use a brush to cut in, they're painting with the paint at the top of the can which has a little less pigment in it. And, when they fill in with a roller, they're painting with the paint deeper in the can that has a little more pigment in it.

And, that difference in the amount of pigment in the paint being used in each case results in a slightly different apparent colour.

That'd be my guess anyway.

PS: Human eyes are exquisitely sensitive to colour. Japanese pearl sorters can sort pearls into over 25 different shades of "white". And, the most expensive strings of pearls are not only those where each pearl is perfect, but where every pearl is exactly the same colour.

 

[sayluv]

I don't recall seeing it when we bought the place but maybe it has always been there. As long as its not from water then I guess we are good. thanks.

 

[Nestor_Kelebay]

If what I'm saying is correct, and the corners are darker just because of pigment separation in the paint, you'll see varying amounts of colour difference in every corner, depending on whether the cutting in brush was being dipped into pigment-rich or pigment-poor paint.

If I understand Gymschu's explanation correctly, you should see the same amount of colour difference in every corner of every room.

 

[sayluv]

yea, its just that one corner. it has to be that. thanks.

 

[ToolSeeker]

Since it's just one one corner maybe someone did a repair in that area and didn't prime the new mud.

 

[Nestor_Kelebay]

Since it's just one one corner maybe someone did a repair in that area and didn't prime the new mud.

Well, it could be anything.

But the bottom line is... ...it's nothing. There's no problem there that needs to be corrected.