Dampness on wall


I moved into a new build a few months ago and put a large plant pot on a window ledge. I noticed today that the self next to the pot and the adjacant wall has some bubbling, the wall yields a powdery substance when rubbed. I think the plant must have got watered and then it has overlowed, unnoticed, onto the shelf. I am not much of a diy person but is this something I can deal with easy? The area feels dry and i anticipated rubbing the area down and repainting. Right? Wrong?
Thanks for any advice you can give me.
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"Michael" wrote:

You are right, rubbing with a fine abrasive paper or block will remove any loose paint and powder. How will you match the freshly painted area with the rest of the room? You wouldn't believe how many shades of magnolia there are! If you have some unused paint from the original work, stir it well to get a good match.
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On Sun, 19 Nov 2006 17:28:44 -0000, Curious wrote:

Thanks for the reply. The builder left me 5 litres of the paint used in the house...parchment was the colour used ....I suppose there will be some difference in shade as the original painting was done a year ago.
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You'd be surprised!! This is the first place I've lived in with no history of smokers, and I can tell the ceilings are relatively clean... ... I patched a few square feet in my son's room with bog standard white emulsion, it's covered the paint splashes that it was meant to cover, and it's matched perfectly! I keep trying to see where the patch I painted was in different light conditions, but I can't. ___________________________ The Grim Reaper

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"Michael" wrote:

You should get a perfect match if you mix well so that all the pigments that have sunk to the bottom of the can are evenly mixed.
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