We use a hopper tank with agitation and then pump into an auger near the bottom to be sure its mixed. We do this into a hopper wagon with a scale to be sure we are applying the correct amount of product ( this also works well to give the seeds a chance to absorb the liquid and then move the seeds to our tender truck). We are treating relatively large batches of many tons at a time so this works well for what we need. For smaller batches we have used an electric drive cement mixer. Depending on the size of batch, you can do a great job of application and can usually get the seeds to absorb more than the auger method.