black paint - first coat

Everyone knows that to achieve a smooth finish on any surface, you should use multiple thin coats of paint. Conventional wisdom, right?

So why did I decide to use the thickest paint I could find?

I put one coat of gloss black Rustoleum enamel on the back and insides of the cabinet. It looks like garbage. If it doesn't dry smoothly then I will sand it and try again with a different black paint.

I hate painting.