Make everything around you look shipshape and professional. A wise lady once told me "A project isn't finished til there's a "finish" on it. Get it?"
Any object tends to look like crap after it's been outside for a while. Metal rusts. Paint flakes off. Wood discolors and starts to crack. And the project you spent so much time on is yet another eyesore to irk the normal people.
A spraygun is the magic wand that will solve your problem. It really is just like magic.
Paint a multicolored object all one color, and it suddenly looks like a real thing, not some crap stuck together. Paint it white, black, or grey to match the theme of your surroundings, and suddenly it vanishes. It's become a part of the surroundings. No one would think of making you get rid of it.
I just made this metal hand truck look like part of the solution.
A few minutes ago it definitely looked like part of the problem.
Stuff you'll need:
Filter Mask with organic vapor (charcoal) cartridge
Angle Grinder with Cup Brush
Sticks, rags, and something ugly, rusty, and dry to paint.
Here's the motion you'll be making with your spraygun:
Step 1: Safety Gear
The mask keeps your lungs and brain from filling up with solvents and dirt.
The rubber gloves and long sleeves keep solvents from soaking in through your skin.
They also keep your hands skin-colored.
The jackhammer headphones preserve your hearing for future enjoyment. They also play mp3 lectures from the London School of Economics about how Instructables is awesome.