using spray can then getting a shop to clear over it is like putting make up and a skirt on your grandma and thinkin its hot. only problem with that is spray can is lacquer based were as clear is urethane based.if you keep everything urethane based, you usually have less problems in the end. and when u start running out of aerosol itll spit and sputter and show up in the paint job. single stage is definatly the way to go if you want shiny on the cheep, but if you don't have the gun/compressor/place to spray it, its pointless.