The problem with using spray cans for 1/72 scale is the spray pattern. You'd probably be better off using the short Testor's spray cans rather than the full sized Krylon (or other brand) paint cans. You might even find the mix of available colors is better since they've been formulated for painting models, and thier small size makes them easier to control. The best practices to apply while using spray cans is to gently heat the can in warm water (don't heat it on the stove, just run it under hot tap water, this will pressurize the can). Shake it well to mix the paint and propellant thoroughly, and apply the paint in several light "mist" coats, holding the can 12-18 inches above the model, allowing the paint to dry between coats. Try not to start or stop the paint flow above the model, since this can cause splatters of paint where you don't want them-- rather, start your painting pass before getting over the model and end it after you pass over it. I like to paint on a large piece of cardboard with the model "anchored" by a strip or two of double backed tape. I can then angle the model for better coverage. Spray cans have thier limits, you should really consider an airbrush and compressor at some point for better variety, style, and less waste, but with proper technique and masking, along with practice, you can accomplish some nice work with a spray can. You can get a "good" airbrush set and an adequate compressor that wil fit into the space of a large shoebox (both Tamiya and Iwata offer these) and the paint pattern will be far less than a spray can, so space shouldn't really be a limiting factor. Good luck!