I used rustoleum gloss. The trick with that is 2-3 coats. You get the 1st - 2nd coat as mainly flat even though it's gloss. Then the third coat or if applying heavy on the 2nd coat it will become glossy. NOTE: I used packing tape on some parts and you need super long dry time before you apply anything to it. I tried taping off some parts on the wings with blue painters tape and even a day later it peeled off.
I actually left the back bottoms open so there's less drag. It's a "slit" that's 3/4 of the scoup. I was gonna put in a slit as well and then I thought how much pressure might be put elsewhere in the plane and decided against it.