Determine the coverage area for each color and estimate the number of gallons you'll need for each. For odd walls with angled ceilings, make your best guess. If you're not comfortable doing this, measure the wall at its highest height and multiply that by its width. Now subtract the lowest height from the highest height, multiply that number by the width, cut that answer in half, and finally subtract that new number from the original height by width. That should give you the wall area.
I would love to explore installing this system in our home. Sadly, the nearest gas line is just down the hill from us on the cross-street. Quoted price by New England Gas to bring a gas main 300 feet up hill - $25k, and that doesn't bring it to the house, just the street in front of the house. We have municipal electricity, so the price is low currently, but we have an oil furnace for heat & hot water. Neither of these sounds like a cost-effective replacement for gas.
Most pros don't bother cleaning brushes and rollers if they are going to use them the next day on the same job. "Latex paint dries slowly in cold temperatures," says Maceyunas. For two-day jobs, he wraps the rollers and brushes in plastic grocery bags and sticks them in the refrigerator. "Just allow the roller to return to room temperature before reusing it," he says. Roller covers are almost impossible to clean thoroughly. Most pros buy new covers for each job.
Home Interior Painters