Not something to brag about? When you do graffiti, there's a lot of repetition and practice involved. There's also a large community of people (who are very hostile to outsiders and hard to contact) with a knowledge base comperable to that of the costuming community.
Spraypaint is the kind of thing most people on this forum will buy based on a recommendation online (or the price on the shelf), use half a can to paint one small item, and leave the rest to go bad or get thrown out. Painting a mural with spraypaint will easily empty 5-20 cans and leave you with a lot of partially used cans, too. Getting good at it requires painting often, therefore I've bought A LOT of paint over the years. Spraypainting a wall is done all at once without waiting for each color to dry, so there's tricks to that. There's also can-control similar to the control you'd need to learn for a Dremel thru experience (except you probably don't learn to use a Dremel in the dark). There's different spray tips (which most people don't have because they have to be ordered in quantities of 50-100pcs). Some tips work better with specific brands. Different quality brands and finishes (flat, satin, gloss) are useful for different parts of a piece.
I was stating that I'm familiar with all of this, but there's a reason I've never used much metallic paints. Now if you wanna debate legallity of vandalism of abandoned, crumbling buildings with me, we can do that with PMs and not fill a Darth Vader costume thread with off-topic conversation.