Ok... a quick lessson on paint. Paint can be a single stage paint, where you apply the color and it dries with a gloss. Or it can be a multiple coat system (sometimes called basecoat/clearcoat). The basecoat is the color, and dries dull, the clear coat is just that, clear, and gives the gloss. It is more expensive, and has some environmental hazards in that clear coat as it dries produces isocyanates - the thing that killed all those people in Bhopal India a decade or two ago. BAD stuff. So if you wanna paint clears you need to protect yourself. That stuff can even be absorbed through the skin.
I'll stop being preachy, for now, but unless you have proper gear, leave the clears to the Monmix's types with a shop and the right stuff.
Urethane Base/clear is the current state of the art.
Oh and while it is technically applied on top of the base, there are chemical interactions for adhesion.... does it chemically melt into a single coat of paint? well, no, not really.
