Stencil Street Art

Decide now what you are painting on and confirm you are allowed to paint it. Canvas, board and your own fence need no permission; anything else needs it in writing before you cut a single line.

Choose a photograph with strong directional light and clear dark and light masses. Flat, evenly lit images have no structure to reduce and collapse into a blob.

Reduce the image to pure black and white with a threshold adjustment, and slide the threshold until the subject is still readable. Two tones is one layer and one cut — start there before attempting three.

Print the reduced image at the size it will be sprayed, tiling across several sheets if needed. Scaling after cutting is not possible.

Go over the print and mark every black shape that is completely surrounded by white. Each of those will fall out of the sheet when you cut it, and each one needs a bridge.

Draw 3-5 mm ties connecting each island to the surrounding material, placing them where a line already exists in the image — a fold, a hair, an edge. Bridges are always visible in the result; the craft is making them look intentional.

Spray-mount or tape the print onto mylar or oiled card. Mylar survives dozens of sprays; paper stencil goes soft and furry after two.

Mark two crosses well outside the image area, in the same place on every layer. Without them, multi-layer work cannot be lined up on the wall.

Cut the interior detail before the big outlines, on a cutting mat, with a fresh blade. Once the large areas are open the sheet flexes and the fine work tears.

Cut on a pull stroke with light pressure and turn the sheet rather than your wrist. Wrist-driven curves wander; rotated sheets give clean arcs.

For a three-tone piece cut a second sheet holding only the mid-tone shapes, aligned to the same registration marks. Sprayed in sequence light to dark, two layers give most of the depth people associate with stencil portraits.

Clean the surface and mask a generous margin round the stencil with paper and tape. Overspray travels much further than a first-time sprayer expects.

Spray outdoors or with real ventilation, wearing a respirator rated for organic vapour, not a dust mask. Solvent and propellant are the genuine hazard in this build.

Tape all four edges down and press the middle flat. Any gap lets paint creep under the sheet and the edge goes fuzzy.

Hold the can 20-30 cm off and spray several thin passes, keeping the can moving and starting the stroke off the stencil. One heavy pass is what makes paint run under the edge — thin coats are the entire technique.

Peel the sheet away perpendicular to the surface while the paint is still tacky, without sliding it. Dragging a wet stencil smears the whole image.

Let the first layer flash off, line the next sheet up on the registration marks and repeat. Rushing the wait lifts the first colour onto the back of the second stencil.

Wipe the mylar down before the paint cures. Build-up around the cut edges thickens them and softens every print after.

Older than any of it. The stencil is arguably the oldest image-making technique that survives: hand stencils on cave walls, made by blowing pigment around a hand held against the rock, are among the earliest surviving images anywhere. The principle has not changed — mask, apply, remove.

Pochoir. Stencil colouring was industrial long before it was subversive. European woodcuts were coloured through stencils from about 1450, and the French pochoir process was used commercially into the twentieth century for high-quality hand-coloured book and fashion plates.

Paris, 1981. Blek le Rat began painting stencilled rats on the streets of Paris in 1981 and is generally described as the father of stencil graffiti. He had seen New York wildstyle graffiti on a trip in 1971 and deliberately chose the stencil instead, on the grounds that it suited the classical architecture of Paris better than large freehand lettering. He was among the first to work at life size, which is what pulled the technique away from small tags and toward figures that read as people. He cut his stencils by hand. The pseudonym came from the comic character Blek le Roc, with 'rat' as an anagram of 'art' — and he described the rat as the only free animal in the city.

Why the technique spread. Speed and repeatability. A stencil that took a day to cut can be sprayed in fifteen seconds and used a hundred times, so an image can appear across a city in a single night by one person. That is a genuine property of the tool, and it cuts both ways: it is what made stencil art a recognisable movement, and it is also why the technique has a long association with property damage. The legal line is not a technical one — it is entirely about whose wall it is.