I decided to start painting the Baneblade with the spray gun this evening. I figured it would be a snap, or a total nightmare, so it was my sole project. It went surprisingly well. I read the GW instructions on their website a few days before, so I knew to get two cans of propellant. The instructions that come with the spray gun are incomplete, so I advise watching the video or reading the instructions online.
As discussed online, the propellant gets cold as you use it, with a corresponding drop in pressure. You need to have a second bottle handy while the other one warms up. Sure enough, I was just finishing up the Baneblade when the second bottle began losing pressure. The first coat took about 15 minutes from beginning to end, compared to the 2-3 hours it would have taken with a brush. Clean up was simple with water. I used nearly a whole bottle of paint, so there wasn't much to pour back in the bottle.
Also, one minor issue: Be careful when attempting to mix the paint in the glass bottle. I recommend you stir it rather than shake it, as the bottle is not completely sealed when the cap is screwed on. I ended up getting paint on my shirt.
Our tools for today. Adeptus Battlegray will be my first coat, followed by camo masking, a coat of Mechrite Red and then Blood Red over that. Once the masking is removed, I'll go over the camo edges freehand with Codex Gray.
Unpacking the parts. I was glad I had read the online instructions, as the included ones don't even cover all the steps to assemble it.
Test painting on some cardboard. Although you can adjust the spray in a couple ways, I left it stock without any problems. My big question is how to use standard Citadel paints with this. The instructions online specify foundation paints. I'll probably try it straight out of the bottle first and then cut it with water, if necessary.