A method of stabilizing aqueous solutions of antimicrobial silanol quaternary ammonium compounds (SQACs) from premature polymerization where the stabilizing agent is selected from a list of antimicrobial, naturally occurring, renewable, volatile, liquid phytochemical essential oils that easily form crystal clear microemulsions when water is added to the concentrated SQAC/essential oil mixture. These non-foaming oil-in-water microemulsions have excellent long term storage stability, remain very low in viscosity and do not phase or precipitate for many months. Many essential oils found to be useful in this process are non-toxic food additives having pleasant scents, have low flammability yet are volatile enough to evaporate upon cure down of the SQAC, resulting in a higher concentration of SQAC in the cured, antimicrobial film. Economically shippable concentrations of stabilized SQACs can be further diluted with water to application concentrations without losing any stabilizing properties and remain storage stable at these lower concentrations indefinitely.