I’m sorry, not trying to be a snob but I disagree with the first paragraph of this article. Rattle can isn’t a “viable way for the do-it-yourselfer to finish up scratches, rust outs” and especially “color-match spoilers and trim”.
Rattle can paints are excellent for small brackets, braces, old looking suspension parts, crossmembers and other such bits. But NOT the body. I’ve been away from the collision/body repair industry for nearly 40 years but aerosol paint work on the body of a car always sticks out like an out-house in the fog.
If this is where an owner claims their job turned out terrific, then satisfaction threshold is low or he got so lucky with color match, metallic, texture, adhesion and blending that I hope he also bought a power-ball ticket the same day. Paint codes get you close, but UV, weather and age all play a part. And you’re definitely not duplicating the conditions like humidity and air pressure and spray pattern that were originally used with the paint job being “matched”. Not to mention dirt, dust and other contaminants in the air.