Hi Chrno,
Quote:
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The wall-substance that is painted over by white will drip to the ground.
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Do you have water pipes in your walls? Hard to imagine a substance that would drip to the floor that isn't being fed from something.
If you are confortable that there isn't anything feeding the spot, use a putty knife and dig it out. Fill the hole with sheetrock mix (spankling compound) and smooth with wide putty knife or other edged tool. If you dig it out deep, let it dry and then reapply. On the last application and while it is still wet, use a paint roller with a medium knap and lightly roll over the place. That will give you a matching texture.
Let it dry and then paint it using a roller. You may have to put on two coats to keep a light colored spot from showing through.
Hope this works for you.
Best regards,
Mack1