Still mixing with a drill motor and a paddle? If you are mixing more than 3 bags an hour then you need to step up to a versatile Imer Mix 60 Plus Electric Mortar Grout Plaster Mixer and mix a full bag of material at once in low speed rotation. Most drills are meant to spin fast which creates a mudslinging wall splattering experience. The Mix 60 Plus can solve your problems by adding your 50-60 lbs of stucco thinset epoxy and etc. in a controlled and easy method. The top splash guard allows you to add water and more material as the paddles are spinning without missing a second of mixing action. Walk away from the mixer "prep" your next batch since this unit is hands free then come back and repeat the process. Stop paying a laborer to be a drill stand and get them working on other things. An optional self-leveling paddle is available to mix your underlayment materials two bags at a time!