I am switching my operation from HVLP gravity feed guns to pressure pots. So far we have switched the solvent-borne primer coatings successfully and have ordered a second setup for pigmented, solvent topcoats. The primer is working well. We expect the topcoats to be fine also. Not having to constantly refill the cup any being able to turn the gun in any direction, including upside down, is great.
We use a waterborne pre-cat product for our clears. I have heard various recommendations on what type of pressure pot is required for waterborne to prevent rust, etc. One recommendation was for a complete stainless steel tank (about a thousand bucks just for the pressure pot). Other thoughts were to use teflon-coated tanks, or stainless just on the "wet" parts. I think there are some other variations as well. For the volume of work we have, placing a 1 gallon container inside a 2.5 gallon tank seems to be working fine. We may use 1-2 gallons max during a spraying session. A half day later, we may use another 1-2 gallons.
Also, since we use a satin sheen, there is a flatting agent that needs to be stirred. Is an agitator built into the tank worth the cost? Or, is it just as easy to open the tank, stir the contents, and continue if the finish material has been setting for an hour or so?
I don't want to spend a thousand plus on a pot if a couple of hundred will do essentially the same thing. But, I don't know what I don't know. So, I am asking for advice. Thank you.