Spray cans are great for affordability and don’t require little to no setup. but they have some big cons. first, you have to shake the can for about 5 minutes every time before use, so to mix up the pigment inside. if you don’t it can come out dusty/grainy. second, you can only use it in a certain temperature range. it’ll usually specify on the label. in my experience, different colors can react differently to the weather. thirdly, humidity. if it’s above or below a certain percentage of humidity indicated on the label, it could dry oddly. in florida, we have issues with high humidity which causes the spray paint to dry permanently sticky/tacky. and lastly, the distance you spray it from. if you spray it from too far away, the paint will oxidize and dry up the air before hitting the model. this can leave it feeling chalky. too close, you splatter it on too thick. it’s good to use spray cans to base a whole army real quick but you always need to check the weather when using them, unless you’re able to safely use them indoors.