
SOLUTION #1: Wash the area with warm water. Light scrubbing may be necessary. The white streaks will disappear and the coating will reappear intact..
Another condition, blistering, could also occur on insufficiently cured latex paint. What happens is water gets behind the paint film while it is still curing and blisters begin to pop up.
SOLUTION #2: Do not disturb the blisters. The blisters will recede as the water makes its way through the paint film to the surface.