One thing to consider: Flat black paint doesn't last forever.

1. You'll need to re-spray your car every XX amount of months.
2. The flat black in a can is not a "sealed" paint, hence why it fades.

It will look good the day that you spray it, but give the car a wash and you'll have water spots galore. Enjoy.

 

My S5 is read and I wanted an aluminium hood. The one I found was blue so I flat blacked it with the wallmart cans. I sanded first with 320 grit on a palm sander then used an entire can. Let it dry and then sparayed it again with another whole can. Once it had dried I gave it a really quite wipe down with a wet red scotch brite to make sure everything was even.

It's not perfect but it's not too bad at all, especially for the $3 I spent to do it. I think the biggest mistake people make with rattle cans is only doing 1-2 coats. You should be doing 5-8 thin coats to ensure good coverage and a thick coat which is needed to hide the original color.

 

Was too god damn cold to drag the car out, i'll try again later. My spray finger didn't work again for about a week after i rattled my car.

 

Never tried one but if doing a whole car it might be worth testing out.

 

that works but if its the one with its own built-in cap on the gun handle, it clogs up real easy.... trust me i used to paint on walls haha

 

Mine was a budget job, I couldn't afford such high class amenities.... my finger will never be the same.