How much coolant are you useing? I just got my shotmaker couple weeks ago, made my stand and adapted a cooler for catch tank. I am currently useing straight water, with decent results. I get the same bugger pieces if it doesnt roll off lip as any coolant. But if I start the machine when I am ready and fill the cooler to level with warm water seems to run nice.
Second batch my boy helped fill the tank and he used cold water and we had 10pounds of pop corn shot. We shut down and started fresh with warm water and was good to go again.
If I were to use anti-freeze guess I would leave in jugs in the house by heater vents till ready to use put it in when lead starts to melt.
BTW it was in the teens in the garage on the evenings we made shot.
Jerry Lewis