SePRO MSO - 1 Pint BottleSePRO MSO (methylated seed oil) is a wetting agent, activator and penetrant all in one that increases the effectiveness of many of SePRO's pond and lakefront products. SePRO MSO helps break down the waxy cuticle on the leaf surface and helps penetrate the bud and bark area of woody brush, allowing a more effective uptake of the herbicide., a low viscosity oil and is compatible with most aquatic herbicides and algaecides. How to Apply SePRO MSO is