A new automated method of making non-contact real-time automotive coating thickness measurements using laser based ultrasound technology  is presented. The system is capable of making wet film measurements on any automotive paint material, predicting the resulting cured film build to a precision of ±1.5 μm. Importantly, the measurement does not require an elaborate calibration to determine the film build; the system should therefore be more reliable and simple to maintain. The system was designed with on-line automotive film thickness measurements as a goal and thus is expected to fit into the painting process with minimal difficulty. The future intent is to use this gage in a closed-loop feedback control system.