How to remove a 'line' running down the wall

[happypeter]

Hi,

So I guess it is the opposite of a crack, a line or ridge running down the wall. I have tried sanding it down and re painting but it re appears straight away.

At first I just thought I wasn't sanding it enough so I sand it again until there is no ridge and re paint...but it comes back!!

Aside from re plaster anything I can do?
thanks

 

[motorbiking]

Rake it out with say a chisel, fill and repaint.

 

[happypeter]

Rake it out with say a chisel, fill and repaint.

Would that not also leave a visible line down the wall? or would sanding it down after filling make it invisible? Just worried I might make it even worse
thanks

 

[Chivas69]

Looking at that I'd say it was a gap between two boards (plasterboard). Basically you can try doing as said above. Try and channel the line out in a v shape. Then refill with pollyfilla and sand down flush. You will still see a line as the walls look textured but it won't stick out. If it then bulges out again then one of the boards must be moving!

 

[happypeter]

I'd say it was a gap between two boards

Its about 120cm from the end of the wall so I think you're right. Wondering if I could put a few screws either aside of the line to minimise any movement. I will do as advised.
thanks

 

[Chivas69]

Can you feel any movement if you press either side of the line?

 

[happypeter]

No the wall is solid. There is a radiator underneath, maybe the heat causes it to expand/contract? although never heard of that before

 

[motorbiking]

Radiators can be hung on plasterboard. Are you saying its not a plasterboard joint for this reason?

 

[Chivas69]

Hmm, there could well be a pipe coming down the wall to the rad. I've seen it quite a few times. Or like you say, if the joint is right there it may be expanding from the heat over time!