Your first LED neon sign, start to finish

Most people stall out before they start because glass neon looks intimidating. LED flex strips changed everything. Here's the complete beginner build, from design sketch to sign on the wall.

By Colin B. · Published June 7, 2026

LED neon sign making has a reputation problem. People hear “neon” and picture a glass tube craftsperson with a gas torch and 10 years of experience. That’s real neon. What you’re doing is different: flexible silicone LED strip, a heat gun, an acrylic backing board, and a weekend afternoon. The results are nearly indistinguishable to anyone who isn’t a neon professional.

Here’s exactly how your first sign comes together.

Before you start: the design phase

The single mistake that costs beginners the most time and money is ordering materials before finalizing the design. Measure twice, order once.

Sketch your sign on paper first. For lettering, write the words at roughly the scale you want, then trace the letter outlines with a single continuous line (following the centerline of each stroke). That continuous tracing is your flex path: measure its total length in centimeters, convert to meters, and that’s how much LED flex you need plus about 10-15% extra for waste and test sections.

A few things to decide before ordering:

Size. A 12x18-inch sign is a good first-sign size: big enough to look intentional on a wall, small enough to handle easily. A 24x36-inch sign is doable for a first build but leaves less margin for error on bends.

Color. Single-color warm white, cool white, and red are the most forgiving. Bright colors like neon pink or green look vivid but are harder to photograph consistently.

Backing color. Clear acrylic gives you the floating-letter look where the sign appears to hover off the wall. Black PVC foam board hides the backing and works better on dark or busy walls.

Bending the flex: the actual skill

Bending is where most beginners either succeed or give up. The good news: it’s much less finicky than it sounds.

Print your design at full scale. If the sign is larger than a single sheet of paper, print it in tiles and tape the sheets together. Lay the printed template on your workbench.

Cut your backing board to your sign’s outer dimensions. Transfer the flex path from the paper template to the backing using pencil or masking tape.

Now bend:

1. Hold the heat gun 4-6 inches from the flex strip, low temperature setting, and move it slowly and continuously along the section you’re working.
2. After 10-15 seconds the silicone becomes noticeably softer and pliable.
3. Bend it gently to your desired curve. Press it against your paper template to confirm the shape.
4. Hold it in place for 15-20 seconds while it cools. It will hold the shape once cool.

For tight inside curves (like the bottom of a U, or the inside of a C), make shorter passes with the heat gun rather than one long one. And never hold the heat gun stationary on the flex. Moving continuously is not just advice; it prevents melting through the silicone coating entirely.

Clip each section to your backing board with mounting clips as you go. This locks the shape while you work on adjacent sections.

Wiring: simpler than it looks

Once the flex is bent and clipped into position, you need to wire it to a power supply.

The basic circuit is very simple: positive and negative wires from your flex connect to the positive and negative terminals on your power supply. If your flex kit came with a barrel connector and your power supply has a matching socket, it’s plug-and-play. If you’re using a MEAN WELL supply with a screw terminal block, strip about 5mm of insulation from the wire ends and tighten them into the appropriate terminals.

A few wiring tips that save beginners a lot of frustration:

• Calculate your wattage first. Multiply the flex’s watt-per-meter rating by your run length. Add 20% headroom. That’s your minimum power supply size.
• Wire in parallel, not in series. If you have multiple sections of flex, each one should connect directly to the power supply, not chained one after another. Series wiring causes uneven brightness.
• Test before you mount. Always power the sign up on the workbench and confirm every section lights before you pick up the drill.

If a section doesn’t light, check the cut points first. LED flex must be cut between the marked intervals (at the LED repeat point), not across a chip. A bad cut breaks the circuit. Recut at a proper mark and reconnect.

Mounting the finished sign

The classic neon sign mount uses clear acrylic standoffs: barrel-shaped spacers that hold the backing 1-2 inches off the wall, creating a gap for the power cable to run behind the panel.

Mark four corner mounting points on the backing board (or six points for larger signs). Drill through the acrylic slowly at those points using a proper acrylic drill bit at low speed. A regular wood bit run fast almost always cracks the panel.

Thread the power cable through the gap behind the panel or drill a small hole in the lower edge of the backing for a cleaner cable run. Mount the standoffs to the wall first, then hang the sign on them.

For smaller, lighter signs on finished drywall, heavy-duty Command strips are a legitimate alternative if you’d rather not drill. They work reliably in dry interior spaces and come off cleanly.

What goes wrong, and how to fix it

Uneven brightness along a long run. Almost always a voltage drop issue. You’re driving too much flex from one end. Add a second power injection point at the far end of the run, or switch to 24V flex for long runs.

A dark section in the middle. Check the cut point. If you cut across an LED chip rather than between the repeat marks, that chip and those adjacent are broken. Recut just past the break and reconnect.

The flex won’t hold a bend after cooling. The silicone wasn’t warm enough before you bent it. Give it more time under the heat gun (15-20 seconds minimum for standard flex) and hold the bend for a full 20 seconds while it cools.

Visible hotspots (individual LED chips visible instead of a smooth glow). The flex is too far from the backing, or you need frosted acrylic. A small gap between the flex and the backing diffuses the light more than having them flush against each other.

What to build next

Your first sign will teach you more than any tutorial. Most builders find themselves planning sign two before sign one is even on the wall.

The natural progression: single-color lettering with clear backing first, then a more complex multi-word layout, then a two-color sign with separate sections wired in parallel. RGB color-changing flex is fun but adds a controller and wiring complexity; save it for sign three or four, once the base build feels automatic.

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Ready to buy? See the LED neon sign making gear guide for the specific flex strips, power supplies, and tools worth buying, plus everything you can skip for now.