Drying out damp before painting

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I have a spot of damp on a wall between kitchen and bathroom which was causing paint to peel off. I have scraped off the paint and am letting the plaster dry out (have put a dehumidifier in front and the plaster has visually lightened in colour a bit so hoping that it will dry out completely). See the picture attached

My assumption is that the cause of the damp is condensation from the kitchen/bathroom climate.

What would be the best approach/types of paint, or other damp proofing products for repainting this area once dried out, to hopefully avoid the issue returning?

Many thanks for any advice
 

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The other side is just tiled wall next to heated towel rail.

The kitchen floor is tiled concrete so not sure if it would be rising damp.
Thanks
 

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the wet patch in your picture is typical of a plumbing leak.

Is it a concrete floor?

Does the washing machine leak?
 
What would be the best approach/types of paint, or other damp proofing products for repainting this area once dried out, to hopefully avoid the issue returning?

none.

mend the leak.
 
Check the washing machine connection on the valve and at the back of the machine.

Andy
 
the wet patch in your picture is typical of a plumbing leak.

Is it a concrete floor?

Does the washing machine leak?

yes it is a concrete floor. The surveyor though it would have been poured directly onto the ground

I have checked around the washing machine and can’t see any sign of a leak but will keep an eye in it next time we do a load.

For additional context, there is also paint flaking in the other side of the door, and above, which led me to assume humidity/condensation was the culprit.
 

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Is there a pipe buried in the floor (or wall)?
 
I don’t think so but can’t be certain without making a hole to investigate. The heating pipes are all external (in the bathroom) and don’t leak.

The only possibility I can think might be the drainage from the bathroom. I don’t think it runs directly under there though.
 
Having had the plaster exposed for a while now, I have now noticed small crystals forming in the surface. Is this a sign of anything in particular?

if I hack off the plaster to try to locate pipes (would they be buried within the plaster??), is there any type of plaster patching product to use as a patch up diy job to re cover before painting?

thanks again if anyone has any further advice.
 

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