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In aircraft, the 2 coat filler is a mandated minimum, also with cross coating. The test is a 100 watt light bulb inside the structure, in a darkened hangar looking for light bled through, usually at the reinforcement tape seams. Keep adding silver dope until you cant see bleed through. 1: not practical in this case, 2: your paint is also not high enough uv blocking solids. Rutan did find that most automotive primers had enough solids after 2 coats. He also recommended white as a primary color
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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