Cutting a glass stencil by hand with a craft knife is slow, and the second copy never matches the first. Cut the stencil on a Silhouette Cameo instead, stick the vinyl to the glass and fill it with POSCA markers, and every piece comes out with the same clean edges. This guide runs the whole workflow from file to finished piece, and links to our guide on paint markers for glass art and glassware for surface and colour choices.
- For POSCA markers on glass with a Silhouette Cameo, cut an adhesive vinyl stencil, stick it down, then fill it.
- POSCA PC-5M fills larger areas; PC-3M and PC-1MR handle fine detail inside the stencil.
- Run a Test Cut first and press every stencil edge flat so paint cannot creep underneath.
- Keep painted glassware decorative and test your paint on a spare piece before the real one.
Why this workflow works
A cutting machine does one job well: repeating an identical shape. POSCA markers do another: laying down opaque, water-based colour with a controlled nib. Put them together and you get a repeatable stencil with hand-painted colour inside it.
For crisp, repeatable designs on glass, a Silhouette Cameo stencil filled with POSCA PC-5M markers is the workflow to use. It suits makers painting a set of matching glasses, jars or vases, and anyone selling or gifting small runs.
The trade-off is setup time. For a single one-off doodle, drawing straight onto the glass is faster. The Cameo pays off from the second piece onward.
Before you start
You need:
- A Silhouette Cameo with Silhouette Studio on your computer, plus adhesive vinyl or stencil material it can cut.
- Clean glass that is dry and free of fingerprints, plus a lint-free cloth.
- POSCA markers in the tip sizes covered below, and a spare piece of glass for testing.
The gotcha that bites mid-setup: tight curves. Vinyl wrinkles on strongly curved glass, and every wrinkle is a channel for paint to creep under the edge. Start on flat glass such as a picture-frame pane, or on gently curved tumblers and jars, and keep the design small enough to lie flat on the curve.
Cut your stencil on the Silhouette Cameo
Set up the design
- Open Silhouette Studio and set your page to the size of your vinyl sheet or roll section.
- Import or draw your design. Solid shapes and bold lettering with open counters work well, since thin bridges between cut-outs tear when you peel the stencil.
- Size the design for the glass. Hold a ruler against the glassware and measure the flat area before you resize.
- Open the Send panel and select the material you loaded.
- Run a Test Cut in a corner of the sheet before cutting the full design.
Expected result: the test square lifts cleanly from its backing without tearing, and the cut line is visible but the backing stays intact.
Cut and weed
- Load the vinyl, send the full design and let the Cameo finish the cut.
- Unload the sheet. Peel away the parts you do not want, leaving the stencil shape on its backing. This is weeding.
- Keep the pieces you removed. You will use them in the second workflow below.
Expected result: a stencil with every cut-out clean and every fine bridge still attached.
Apply the stencil to glass
- Wipe the glass with a lint-free cloth and let it dry fully.
- Cover the stencil with transfer tape if it has many small parts, so they hold their spacing.
- Peel the stencil from its backing and lay one edge on the glass first. Smooth it down from that edge to avoid trapped air.
- Remove the transfer tape, then run a fingernail or a soft card along every cut edge.
Expected result: the vinyl sits flat with no bubbles, and the edges of every cut-out are pressed tight to the glass. This step decides how sharp your lines are, so spend the extra minute here.
Choose the right POSCA marker
The cut-out size decides the marker. Match the tip to the narrowest gap in your design.
| Marker | Tip | Suited to | Pros | Cons |
|---|---|---|---|---|
| POSCA PC-5M | Medium bullet | Filling larger cut-outs and bold lettering | Covers an area in fewer strokes | Too broad for narrow gaps |
| POSCA PC-3M | Fine bullet | Medium shapes and detail inside a stencil | Reaches corners the PC-5M cannot | Slower to fill big areas |
| POSCA PC-1MR | Ultra fine | Outlines, small text, tiny details | Precise lines | Slow for anything but detail |
Most projects need two of the three. A common pairing is PC-5M for fills and PC-3M for the corners.
Paint the stencil
- Shake the marker with the cap on, then press the tip onto scrap paper until the paint flows evenly.
- Test the colour on your spare piece of glass, so you know how opaque it looks before it goes on the real one.
- Work from the stencil edge inward. Dab or stroke the paint from the vinyl towards the middle of the cut-out, which pushes paint against the edge instead of under it.
- Keep the first coat thin. Let it dry, then add a second thin coat where you want denser colour.
- Switch to the finer marker for corners and small details once the main fill is dry.
- Once the paint is touch-dry, peel the stencil back at a low angle, pulling away from the painted area.
Expected result: sharp edges, no bleed, and solid colour inside every cut-out. Follow POSCA's own instructions for the surface and let the piece dry fully before handling.
Keep it decorative. Painted glassware is for display and gifting.
Variant: paint around the shape instead of inside it
The pieces you weeded out are not waste. Use them as a positive mask when you want a coloured background with a clean glass shape left in the middle, such as a moon, a name or a leaf.
- Cut the design as before and keep the weeded shapes on the backing.
- Apply the shape to the glass and press its edges flat.
- Paint the area around it with the PC-5M, working from the shape's edge outward so paint is pushed away from the vinyl.
- Let the paint dry, then peel the shape off.
Expected result: a clear glass motif framed by solid colour. This variant also suits a second pass: paint the background, peel, then use an inside-cut stencil to fill the motif in a different colour.
Troubleshooting
- Paint creeps under the edge. The edge was not pressed down, or the coat was too wet. Re-press with a fingernail along the cut line and use thinner coats.
- Vinyl wrinkles on a curved glass. The design is too large for the curve. Resize the design in Studio to fit the flat area, or switch to flatter glass.
- The stencil tears when peeled. A bridge in the design is too thin. Widen the bridge in Silhouette Studio and recut.
- Paint lifts at the edge when you peel. Peel at a low angle and pull away from the painted area, not straight up.
- Colour looks patchy. Apply a second thin coat after the first has dried, rather than one heavy coat.
Customise your workflow
Once one piece works, scale it. Cut a sheet with six copies of the same design, paint a matching set, and swap colours between pieces. Stencils with small separate parts, such as a name with dotted letters, are easier to place with transfer tape.
The same Cameo-plus-vinyl method carries over to other surfaces. Our workflow for Cricut stencils to painted skateboard decks shows how the cutting steps translate to a larger, flatter surface.
PoscART carries POSCA in single markers, wallets and tins, so you can build a colour range for a run of pieces. Free standard delivery Australia-wide on orders over $149.
FAQ
Can a Silhouette Cameo draw with POSCA markers?
This workflow uses the Cameo to cut a vinyl stencil, and you paint with the POSCA markers by hand. Hand painting gives you control over opacity and layering that a machine pass does not.
Which POSCA marker is suited to glass stencils?
The POSCA PC-5M medium bullet tip is the usual choice for filling cut-outs. Add the PC-3M fine tip or PC-1MR ultra fine tip for narrow gaps and small details.
Do I need transfer tape?
Use it when the stencil has many small separate parts, so they keep their spacing as you place them. Simple one-piece shapes can go straight from the backing onto the glass.
Why does paint get under my stencil?
The edge was not pressed flat, or the coat was too wet. Press every cut edge down with a fingernail and apply thin coats worked from the vinyl towards the middle.
Can I reuse a vinyl stencil on glass?
Adhesive vinyl is built for one placement, and the adhesive loses grip once it is lifted. Cut a fresh stencil for each piece so the edges stay sharp.
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One last thing
Cut one extra stencil of every design and test the full process on a spare jar or pane first. It costs a few minutes and a small piece of vinyl, and it tells you exactly how thick your coats should be before you paint the piece that matters.
