Hi, BlackTulip - I think it's great that you're sharing your modeling hobby with your son, good for you. 27 in 60 days, wow, if I'm really turning them out I might do that many in 2 or 3 years.
Vallejo Model Air does spray nicely, clean up is easy and the finish does appear good. But there are some individual characteristics that really are not stellar. As was said, never mix or clean with alcohol, the reaction will definitely not go well. I only thin with their own thinner, I clean with lacquer thinner, very effective and far less costly.
Speaking only for myself and from personal experience, I find Model Air to be somewhat touchy as to the use of their thinner. My first go at it was a quick test on scrap material. I just put a few drops of thinner in a cup load, mixed it well and sprayed at my customary 12-18psi. It looked great, but it stayed slightly tacky to the touch for about a week, then it set up like any other acrylic would, but was a bit easier to lift with tape and mar with a finger nail.
Sprayed straight from the bottle it still looked fine, went on well and seemed to dry about as quickly as I am accustomed to with Tamiya, but it still wasn't quite as durable in handling.
Vallejo says for preparing to pour Model Air, just "roll it between your hands." Again from my experience, that is just not sufficient. At one point I removed the cap, (just push sideways on the cap and it will lift an edge, then with finger nail lift it the rest of the way off.) Using a small metal dentists spatula I stirred well around the entire bottom of the bottle, then saw the usual glob of unmixed paint solids on the spatula. Then I poured all of the contents into a small cup and stirred with the Badger electric mixer, until a consistent blend was reached. At that point the paint was a bit thicker than I like to spray, so a couple of drops of thinner was added and it sprayed OK, but still seemed to take a few days to set up well.
So, I found that I had a more durable finish by waiting a couple of days, then spraying a clear finish over it and it wasn't so easily damaged by handling for masking or decaling. I have used Tamiya for a few years now, and have since returned to it. For as nicely as Model Air sprays and looks, it just seems too touchy for my use and also I have to order it, my local shop only carries Tamiya for acrylic.
I read great things from others on FSM about different acrylics, next I'll try some of them, just to see. When you do spray your Model Air, remember to use light coats if you do add thinner. Hope it does well for you.
Patrick