A few years ago I got a visit from the city code enforcement officer from my community. It seems that my next door neighbor had complained about me painting my car trailer in the driveway. (It wouldn't fit in the garage). He told me it was against EPA and Texas law to paint without a paint booth.
I contacted my paint supplier and they got me in touch with the paint company's representative. He said he did not know of any restrictions on individuals painting their own cars on their own property. He gave me the number of the Texas Commision on Environmental Quality.
They confirmed that all laws concerning paint and body regulation are aimed at businesses not individuals working on their own cars.
So, unless Grapevine has any laws against it, you are legal. I still am careful to follow common sense, to clean up spills and properly dispose of waste. I try to also be a good neighbor.
Wondertruck thinks home paint jobs look like home paint jobs. A few years ago I painted a 55 Chevy in a friend's driveway. It won it's class in The Ennis Super Chevy Show and got featured in a centerfold of All Chevy magazine. Last year it was pictured in an article in Super Chevy magazine.
Last year I sold a 56 Nomad for top dollar. I won't mention the name of the person who bought it but you would recognize his name. He has a large collection of cars and he wouldn't have paid my price if everything, including paint wasn't correct. The Nomad was painted in my two car garage at my house.