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If one can wasn't enough, you were applying way too much. Usually, a sort can should have enough to paint 2 - 3 or even more.
The trick of using a spray can is to know how to apply the right amount, and it mainly depends on the distance to the object and how quickly you move the can across the model. Farther and quicker means less, closer and slower means more.
Usually, I spray across the model back and forth, and I count it as one layer. Obviously, the base color is still visible at this moment.
I wait for a few minutes, and apply another layer. The color should be opaque enough, but not the paint layer is not enough for sanding and polishing.
Then, I wait for a few days, and repeat the same. At the end, I apply about 5 to 8 layers for 2 weeks period or so. You can guess how thin each layer is.
As long as you know this distance and stroke speed combination, you can use any brand of spray can, but the paint of those expensive hobby sprays is tend to be finer and thinner, so it's easier to apply the amount you want.
Also, if you are going to paint light color, and having a hard time achieving even and smooth color, try using base color between primer and body color, for example white, orange, or yellow for red body, white or tan for yellow body etc. Base color is not necessary for dark body color, such as blue or black.
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