I bought five liters of paint, which cost R250 and turned out to be way too much. I still have about two-thirds left, so I might be traveling to neighboring volunteers to use up the rest. When painting, the importance of getting an even coat was quickly replaced by just getting enough paint on the surface. I found the best method to use a little can as a dipper to pour the paint directly on the roof, then smear it around with a brush. It's not pretty, but the albedo is hugely improved.