Follow the manufacturer's instructions to the letter. Don't try to put too much on at once. When you have the desired thickness, wait the correct amount of time (follow the manufacturer's instructions) and then do your sanding and polishing.
Vehicle: arm yourself because no one else will save you
Location: the odds will betray you
You need to research yourself what to do. It is too steep a learning curve to try and discuss here. At least Google, You Tube, etc. until you at least have the correct methods down for your particular paint job at hand.
Rent a paint booth if you can... A good paint job can be done without one, I've even seen them done during the winter with the proper reducers and whatnot... but temperature and humidity control are huge. And it'll help reduce the brain cell killing.
Buy an old fender from a junkyard and practice on it first.
Good idea but you have to learn to shoot from all positions.
Same way as you get to Carnegie hall. Practice, Practice , Practice. Seriously find some junker/parts car and practice. I’m sure there are some people here that would let you put a coat on a “project” car.
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