I'm painting my car, and I need to know how may gallons of paint will I need?

Paint manufacturers will tell you how roughly much coverage you can expect per gallon of paint, if it's mixed correctly. You need to measure (or estimate with reasonably accuracy) the surface area of the vehicle, multiplied by the number of coats needed. Then add some extra for overspray and wastage when mixing (since this can't be avoided) and you should have a ballpark figure.

The storage capacity is not relevant. What you need to know is the CFM (cubic feet per minute) your compressor will produce. If you have a 3 to 5 HP compressor with a 6 gallon tank in good working order, that should be fine. I used a 5 hp Sears tank for years as my spray compressor. Be sure to mount a drop line for water separation, and run a good filter and regulator.

About 1 gallon. By the time it is reduced you will have plenty with some left over if your car is midrange. The paint shop can give you a better estimate. It is hard to tell because I don't know what your car is.

Your not painting a house..come on guys take it to a pro

Come on guys you can't be serious

Take the thing to Earl's you will get a better job than what you are about to do.

it depends on how big of car.i would say no more the 2 gallons.

paint guy/gal knows...get a good brush