Requiring recalibration A paint circulation system for a painting line, comprising: a supply channel, a return channel, a plurality of drop lines downstream of the supply channel and upstream of the return channel, the plurality of drop lines including a first drop Gustav Klimt oil paintings line and a second drop line, first control means located in the first drop line for controlling a first paint flow rate, the first control means including one or more lengths of first coiled tubing shaped to adjust the first flow rate according to a first flow controlling pressure differential. And wherein the first flow controlling pressure differential is the pressure differential across the first drop line between the supply channel and the return channel, second control means located in the...