Not sure about a video but if you spray paint and it spiders- It looks like a spider, and webs out- it is too thin, and you're probably spraying too close to your subject and focusing on one spot too much. Instead of doing a one-over really heavily, give it a mist and then come back and add the layers onto it. If you spray the paint and it splatters and isn't in a consistent spot, it is too thick, you need to add thinner. What I go by is a 4:1 ratio of paint to thinner, depending on how thin the paint already is. If it pours out like water, it is thin enough, but if it is like molasses, add thinner.
If you add too much thinner, you have to go light to avoid runs and drips. Happy airbrushing!
Just right would be a consistent line, no splatters, spiders or runs. Get a few plastic white spoons and practice on those, eventually you'll be able to get a consistent line. Also try different PSI's on your compressor. 20-25 might work for your airbrush, or maybe 30-35 might work as well. What I go by is the thinner the paint, the higher PSI and the thicker the paint the lower the PSI.