Nick,
Our line of Collector Color paint in 1/2 pint cans is very heavy. We could probably cut w/ thinner and obtain another can or two when packaging. At one time we also packaged in the 'rattle' cans, but most paint packers will not do less than 1000 cans of a color., that is why we have settled on the 1/2 pint cans. I had been talking to Weaver about doing a co-op paint venture , but the Co. was sold before we got into production. The 1/2 pint cans allow for a 'fresher' supply & we can also do small runs.
We have always recommended using a small sprayer in place of an air brush for tin plate restoration. Paasche sells a 3 oz. small sprayer , which we market w/ a 10' hose and will connect to a 1/4" air compressor that puts out 25 PSI. Our paint will need to be cut w/ about 2 table spoons of thinner in the 3 oz. jar. An air brush will require 30-40% thinner to operate, and take 2-3 coats to obtain the same finish as 1 coat w/ the sprayer. The remaining paint in our cans can be preserved simply by placing a piece of 'Saran Wrap' into the can so it lays on top of the paint and seals out most of the air. The Paasche sprayer w/ 10' hose, we sell for $49.95. Extra bottles are available for storage.
We will also have at the up coming York show, the "PRE_VAL " paint sprayer. They list for $9.95, ready to use., we will sell for $8.99 , and the paint will have to be cut only 20% . This is a 6 oz. jar unit. I prefer the sprayer method as it gives a 'thicker', more natural original look finish. I have seen many pieces I have painter 25+ years ago, that the "experts' swore were original as they aged and took on the 'patina' look on their brass and nickel parts.
Hope this helps somewhat. Harry