Can I paint one wall?

[Joe Carrick]

The wall covering tool should work fine for either interior or exterior walls. Just be sure to check the appropriate Interior and/or Exterior checkbox for where you want the covering to go.

Sorry Dermot, you are right - for some reason I didn't see those check boxes.

[vaneel]

One more question - The wall that I was trying to paint goes up into a stairwell. Between the upstairs wall and the downstairs wall there is a white line. I guess this line is part of the ceiling but I would like to get rid of it. Any ideas here?

Thanks!