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I'm not sure at this point about what its coverage is, but my best guess is that its square-inch coverage would be consistent with a similarly-szed can of ordinary spray paint. Since the surface area of the dag coating on a 1940's tube such as 10BP4 and that of larger 1960's tubes like 24MP4 are widely different, I would not be able to predict results that closely. A rough approximation of the coverage of a can of paint less a reasonable estimate of overspray divided by a rough approximation of the dag surface area of an average CRT divided by two coats would be the setup for the calculation.
N= number of tubes
A = total coverage (square inches)
L = overspray loss (percent)
T = average CRT dag surface area (square inches)
N = A*(100%-L)/2T
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