BTW, I consider getting a good gloss paint job an exercise in brinkmanship. You must put down a wet final coat. The way I put it is, keep putting it on until just a moment before it runs. How do you know before it runs? Only way is experience. I sanded out a lot of runs learning what it looks like at that point, and still occasionally miss it. A good repositional lamp is essential. Keep holding the model so that the surface you are painting makes a mirror reflection of the lamp- the brightness of that reflection is the main clue. Even doing flats, seeing that reflection helps getting a good finish. The flat will still have a reflective gloss when it is wet.