After we made 45 gallons of paint in about two hours I got to work adding lime to each bucket of prickly pear. I found that a minimum of six cups of lime per bucket was required. Less than that and you run the risk of the prickly rotting. It was about 25lbs worth of lime or a whole $5 in materials to make about $900 of paint that acts as a roofing sealer. Thie prickly pear is probably the most profitable building material we have discovered while working on the Green Acre project.