Ken, I have the same experience with gloss white. I doesn't cover well, and if I spray too quickly, it tends to pool into corners and not cover open areas. I usually spray on several light "tack" coats, waiting 10 minutes or so between coats until I can go heavier. The bad thing is that if I wait too long, the paint starts to settle in the airbrush cup and dry on the tip of the nozzle. I've never tried to tackle any thing as large as a car body, so I don't know what would work best there.
And speaking of Gloss White, I checked my bottle and found it to be very thick and gooey-well on it way to becoming rubber. I always think that I should check paint conditions ahead of time, but I never do.
I finally managed to make it to the hobby shop and not only replace my white enamel, I also picked up a couple of bottles of Acryl paint to try on the canopy. I started on the inside framework: (plus my paint acquisitions shown here.)
It's a pain to mask this as one of the other drawbacks to using Future is that my Parafilm does not stick to inside curves at all. I can usually coax it to work on the outside curves better. An advantage is that Parafilm tends to harden over time and it is much easier to remove it from the canopy after painting, if the canopy was coated with the future.
Don't know if you can see this or not: ( I still need to do the front and back framework) You can at least see the center member. The rest of the black you see is showing through from the other side.
Also adding some some masking to the cockpit edges-the addition of the PE parts left some "stepped" areas that would allow paint to enter into the edges from the outside.
I also assembled, painted and glossed these under wing bits. Not only do they get decals, but PE parts were provided for them as well.
And finally, I also added a few more of the fiddly bits: I found these to be called "wingtip aerodynamic fins". I thought they were antennae of some type, but the diagram I found has them labeled as "fins". I suppose having that pod hanging out there could be unstable?