table 2 in the composite e coating system of the invention measurement and control of ph and conductivity of the solution are important in order to monitor the effects of ph on the quality of the applied composite coating a 200 m l sample of solution was taken and allowed to stand for about an hour to allow the solids to settle and the bubbles to dissipate the ph is then measured using a clean calibrated ph meter the applicants have found that if a solution is used for too long a period of time or after a large production run without any maintenance the ph of the solution will tend to increase an increasing ph may result in solution broken down resulting in such problems as uneven coating out lumps etc a ph value of 4 8 was measured in a broken down solution the applicants are of the view that a ph level which is too high or too low results in an uneven coating and a poor appearance frequent measuring at least once a day is necessary to keep the solution in a stable state generally a decreasing ph solution has not been found to occur during normal operations if the ph.