Hmmmmmmm.......
Well, to do it right, you will need to have some money in metal, we will assume $100 for metal. Then, you will need primer. I bought high quality primer with the reducer and hardener for $400. I recommend getting some sandblasting done, which then will need weld-through primer, let's figure $100 for that.
So, with all of that, you are at $400, without paint or sealer.
Paint cost for my truck was $250 per gallon.
Clear was $400 per gallon.
Sand paper was $100
And I have about 400 hours in bodywork/rust repair on my truck. Even if you figure that at minimum wage ($7.25 per hour in WI), you get $2,900.
But that was making my truck absolutely perfect.
So, my total, if I paid myself for labor would be $4,150.
Most bodyshops are $65+ per hour though around me.