One thing that seems to take up a large portion of my modelling hours is masking. I don't have a pressure regulator on my current compressor, so overspray is an issue no matter what I'm trying to accomplish. The solution is to mask the heck out of the model.
A good example of that is the RAF B-17 featured below. I have already painted the lower surfaces Black, so it now remains to get the uppers done. Just wrap the thing up in the modelling equivalent of a babushka, and you're ready to go.
More intense detail masking was required to get the Hasegawa Lancaster ready for its first coat of paint. With the canopy and all the turrets with their tiny panes, this actually represents a fair amount of time invested. Thankfully I had an Eduard masking set, because this is one I would hate to have done by trimming individual pieces.