A loaded roller or brush wrapped in plastic stays wet and usable for days — but only if the wrap is genuinely airtight. Pull the plastic tight to the nap, tape the ends, and the air that would skin the paint never gets in.
Cables and pipes run vertically or horizontally from every switch, outlet, and fixture — almost never diagonally. Picture a vertical strip above and below each device and a horizontal strip connecting them, and drill outside those zones.
