I've used auto air colors before on a snow blower and riding tractor (only to airbrush letters back on). The bottle's recommended conditions are 70° F and as little humidity as possible. I would definitely follow those as a guideline. I didn't use a booth or anything, just set up the pieces on horses in my back yard. If you have access to a heat lamp I strongly recommend it, I did not use any heat source and it took about 5-6 days to fully cure with each day being about 75° and humidity around 50%. Humidity is the biggest factor with using water based paints, because it takes longer for the water to evaporate with more humidity in the air. From experience I couldn't tell you if a heat source makes the paint job stronger, however I wouldn't doubt it.
I was very impressed with the auto air colors, they left a very durable and good looking finish, but you must paint it right. With water borne you want to put on very light coats, auto air calls for a 3 coat process, and only the 3rd coat is meant to fill in the entire piece. In other words, they stress over and over not to work with wet coats. This is directly from one of my bottles: "Initial coats have a speckled appearance. Additional coats fill in coverage producing even finish. Final coat should fill in field of color and serve as the "orientation" coat."