I have the feeling this question is going to sound heretic to a lot of the experts
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I've wondered about this for a while now :
Should I paint all parts while they are on the sprue
Or is it OK to assemble first and paint later
From experience it is fine to build and then paint, , as long of course as the assembly doesn't interfere with the painting job, ie preventing the access to some areas like an interior or the hair of a figure under an helmet.
Hopefuly the ayatolahs will have some good advice on the best way to go with painting...