MATERIAL
Posca Pens
Pricey but worth it... These are essentially paint pens. Blendable? Not much. Pigmented? Absolutely. Graffiti artists use these mostly for sketches. Most people's first stickers are on shipping labels, so Posca pens are more useful in that scenario. These fall more under the belt of a traditional paper & pencil type artist, but are useful for brainstorming things such as a large mural painting.
Eggshell Stickers
Eggshell stickers are the ultimate way to be an asshole. This form of graffiti/vandalism is probably the most difficult to remove, being that it only comes off in small pieces when you try to peel it. One in particular that was recommended to me is by the company Montana, who create an array of high quality graffiti/street art materials. Write your message of choice, doodle what you want... it's staying on there for a long time.
Spray Tips
A spray-can's best friend. There are several different sizes and shapes of spray tips to create different effects in typography and artwork. They can be finicky; clogging and faulty tips are common and can be a real pain. It is always best to carry several spray tips with you when going out to do some spray painting.
Paint Sticks
These pens are quite literally paint pens. They consist of solidified paint, much like a pastel. They are high temperature resistant and are often used on trains. These particular pens that were recommended to me are manufactured by Sakura. A common trick used with these are to roll out the paint stick from the inside, cut it in half, and splice it with another color from another pen. This can create a 3D effect.
Deco Color Pens
These pens are better suited for actual graffitiing than the Posca pens. They are highly pigmented, range from chalky finish to satin sheen, and are well suited for stickers and signs. They are resilient against the forces of weather and city wear-and-tear.
Spray Paint
The original. The classic.
