Paint advice needed

I buy from Mac's distributing on Auburn Blvd. They have been fair to me for well over 20 years.
It really is best to buy more than you think you'll need. Running short while doing a job really sucks!
I did a '74 Duster 360 with a gallon of Omni.....The paint was so transparent I had to go 5-6 coats in some areas to cover the primer spots. I didn't have enough to respray the trunklid where I color sanded through. I was already too far into the car at that point and sold it for less than it was really worth. I just wanted to be done with the car.

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That's where I'll be buying my stuff from. They're really helpful there, which is nice for inexperienced folks like myself. Do you spray yours in your shop, or do you wheel them outside to spray them?