wilfish,
I used an inexpensive external mix siphon air brush. That stuff is too thick for an internal mix brush, even when thinned it is still troublesome. I used low pressures in the twenty to thirty PSI range. I also used a slow thinner called Xylene Xylol made by Kleen Strip and thinned down to a 50/50 mix. There are also retarders on the market, but I haven’t tried them. It is very important to use their white base coat to get a good bond or else you can peel the paint off with your fingernail. I found that if I didn’t do these things the paint would spray like spider webs as it was drying in flight, I also had to hold the brush pretty close to the bait. Never did have any drying issues. After all that the results were good, the paint was tough and stood up to the usual rigors of bass fishing quite well. I stopped using it because the fumes are harsh and explosive, and the cleanup is messy. I switched to spraying powder paint and eliminated all those issues.