Eastwood Single Stage Urethane Paint + a few questions

Anyone on here have personal experience with any Eastwood paints? Specifically their UV resistance and overall quality

I have a car I am going to be respraying myself. Eastwood has a good selection of single stage urethane paints and good prices. I want to use a basic non metallic solid color.

Also they have a very loose recommendation on how much is necessary to spray a car.

(Q) How much paint do I need?
(A) Typically one gallon per car. If you are also painting jambs, under the hood, or the trunk, use 2 gallons. For large cars and pickup trucks, use 2 gallons. Number of coats, prep and application methods will affect the amount of paint required.

Its a smaller chassis old Audi, I will be doing jambs, bay and maybe the inside of the trunk. I’m thinking the 1 gallon kit, makes 1.33 gallons of spray-able material, would do it. Also I’m thinking of adding some clear to the final coat, 1 part clear to 3 parts reduced paint, to add some depth and also increase UV resistance.

Any advice would be appreciated. This would be my first time spraying a complete car.