Wavy marks after rollering

[DIY67]

I have been painting with a simple foam roller and Lick paint. All around the rest of the room is fine but this chimney breast is proving to be a pig. I have plenty of paint on the roller, evenly spread. Evenly applying pressure with long strokes but again and again when it dries it shows these marks. It's on normal lining paper that had a darker green paint that went on fine a few years ago. The wall is smooth with no uneven plaster underneath, so what is causing this frustrating pattern everytime. I am on my 4th coat ?

 

[accelerator]

Could it be uneven moisture levels within the wall?

 

[DIY67]

No because it is dry as a bone, especially as there is a wood burning stove in the fireplace. Perhaps use a paint brush ?

 

[robinbanks]

They look like brickwork, ie the mortar lines are sucking the moisture out faster than other areas

How long has it been like this? What tool/material are you using to pronounce it "dry as a bone"?

 

[DIY67]

They look like brickwork, ie the mortar lines are sucking the moisture out faster than other areas

How long has it been like this? What tool/material are you using to pronounce it "dry as a bone"Its

Its not the bricks as it's never been a problem in the 27 years living here with different paints over the years. Its a working stove fireplace as dry as a bone. The outside brick work the same. Gone over it with large paint brush and not showing.

 

[sparkwright]

Is it wider at the bottom, and gets narrower towards the top?
Looks like the shape of the chimney void.
And it looks a bit like a brickwork pattern.

 

[JohnD]

Are the lines the size of bricks?

Was the chimney previously used with coal or wood fires, which lead to tarry soot contamination?

I find your picture difficult to interpret because it is so dark.

 

[robinbanks]

Its a working stove fireplace as dry as a bone

It's not just about dryness; chimneys that spent decades carrying away smoke are heavily contaminated with a variety of chemical compounds and salts, that have all sorts of odd effects on the internal and external surfaces, including actively pulling moisture from the air and that causes the salts to migrate within the brickwork and mortar

For a sure fire solution you could consider boarding over it if stain blocking paints don't work out