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Is an ALL-Stainless Steel pressure pot really needed for waterborne???2/14
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.
When we were using waterborne finishes I bought new pots. Binks makes a setup that has a galvanized pot but the lid and pickup tube is stainless. It costs quite a bit less and all you have to do is keep a $5 pot liner in it to protect the pot. I doubt you will need an agitator. In my experience the flattening paste stays suspended in waterborne products much better than in solvents. Just give it a stir if it has been sitting for a while.
A few options are to use a plastic pot liner if your going to be spraying more than a gallon but if your spraying less than a gallon, a Plastic gallon Paint container works well. Many of the Latex Paints come in a Plastic one gallon "can".
If your concerned about the intake tube, you can get a stainless steel tube and thread it on one end. As for the gun itself, the "innards " should be stainless. Most of them now a days are stainless to begin with.
Most importantly however is to buy/get a pressure pot with dual gauges. You will have much more control over what material your spraying.
Charles, If you think spending a couple of hundred dollars is worth a trial to see if that kind of pressure pot is what you need, than do it. You already know what is recommended but are questioning if it is needed. Take the chance. It may be just fine. But if it doesn't work, well, another lesson learned and then you can be someone on here giving advice to the next person with a similar question.
I've used the older style Accuspray 2 quart pots for over 10 years.
They are aluminum with a plastic coating. The pickup tube is brass. Depending on which WB finish is used there is either nothing to talk about or when you clean up the gun a little grey might get on a white rag from wiping the brass tube. This is nothing to talk about.
I have a clear pot and a paint pot.
If I needed another I would look at the newer wide mouth version. Stainless pots are over kill
Astro Pneumatic Gun