Tests of the TotalStat electrostatic spray system were done. Two TotalStat linear nozzles were set up to apply oil-based chemical solutions from both above and below onto lumber being propelled through a spray booth. Experimental solutions of three antisapstain chemicals known to be effective in aqueous formulations were formulated in either, or both, light mineral oil (paraffin oil) and Canola oil (rapeseed oil). After periods of two and four months the treatments were rated against aqueous formulations applied by conventional hydraulic treatment. The potenial of low-volume, linear, electrostatic spray nozzles and oil-based fungicidal chemicals was evident. Further refinement of the system and formulation improvements are suggested.