Here is a quick way to give your models a nice shine without a lot of labor.

No sanding between any of the steps below.

1. Lightly prime model first. Let it dry a little.
2. Spray color coat. Let dry about 1 hour.
3. Spray light coats of clear until the shines blinds you. Rotate model up / down / sideways / etc. for a few minutes afterwards until it tacks up.
4. Set aside for at least 2 days.

Photos