Hello David,
I may have a solution to your problem; how to preserve your paint and keep from opening the lid,
exposing your paint to oxygen.
This system requires two vessels/containers, one larger than the other.
The smaller container holds your paint and sits below the larger container.
The larger container sits above the smaller and contains your Inert Shielding Gas (ISG).
There is a tap at the bottom edge of the samll can to draw your paint from.
This can is air-tight except for a hose that runs to the large can (above).
As you draw paint, it creates a vacuum in the can that draws ISG from the tank above.
The tank above is larger to ensure that the paint never sees oxygen until it's on the cue.
The large can is vented to avoid vacuum. It will draw air but that's OK.
The air never reaches the paint because you have the ISG barrier.
OK, you've used all your paint and the small can is empty other than it's full of ISG.
Now figure a way to fill the small can THRU the valve that you draw from.
As the can fills with new paint it is pushing the ISG back up into the larger can.
It in turn is pushing the oxygen it's collected back out the vent.
There are a lot of ways to tweak this system to fit your needs.
You can mount a level/sight glass to the side of the 'paint' can to see how much you have left.
If the vent is properly sized in the ISG can, you may never lose any.
The ISG will always be on the bottom of the ISG can and the oxygen will always be on top
until it's pushed back out the vent when you fill the paint can.
Of course, all hardware and components must be compatible with the ISG and your paint.
If you want me to think on this further, just give me a shout.
HTHs, KJ
I may have a solution to your problem; how to preserve your paint and keep from opening the lid,
exposing your paint to oxygen.
This system requires two vessels/containers, one larger than the other.
The smaller container holds your paint and sits below the larger container.
The larger container sits above the smaller and contains your Inert Shielding Gas (ISG).
There is a tap at the bottom edge of the samll can to draw your paint from.
This can is air-tight except for a hose that runs to the large can (above).
As you draw paint, it creates a vacuum in the can that draws ISG from the tank above.
The tank above is larger to ensure that the paint never sees oxygen until it's on the cue.
The large can is vented to avoid vacuum. It will draw air but that's OK.
The air never reaches the paint because you have the ISG barrier.
OK, you've used all your paint and the small can is empty other than it's full of ISG.
Now figure a way to fill the small can THRU the valve that you draw from.
As the can fills with new paint it is pushing the ISG back up into the larger can.
It in turn is pushing the oxygen it's collected back out the vent.
There are a lot of ways to tweak this system to fit your needs.
You can mount a level/sight glass to the side of the 'paint' can to see how much you have left.
If the vent is properly sized in the ISG can, you may never lose any.
The ISG will always be on the bottom of the ISG can and the oxygen will always be on top
until it's pushed back out the vent when you fill the paint can.
Of course, all hardware and components must be compatible with the ISG and your paint.
If you want me to think on this further, just give me a shout.
HTHs, KJ