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Bike names, car stickers and reflective shop lettering are all radium cutting jobs. The film is thicker than ordinary vinyl, so the same blade setting that works on sign vinyl often leaves letters that will not weed.
This guide from Skycut India covers how to cut radium film: blade choice, force, loading, weeding and the problems shops see most often. For a model shortlist, see the best cutting plotter for radium stickers.
Quick answer
- Radium cutting means kiss-cutting retro reflective film on a plotter.
- Use more force than for thin vinyl, and a sharper or steeper blade on thick film.
- Always test-cut a new roll before the customer job.
- Everyday shops: Skycut V24. All-day radium: VH Series. Thick film: D Series.
What is radium cutting?
In Indian shops, radium means retro reflective film. It contains glass beads or micro-prisms that bounce light back toward headlights, which is why the sticker shines at night. It does not contain radioactive radium.
Radium cutting is plotting that film into names, numbers and shapes. The blade cuts the reflective face and the adhesive, and leaves the liner. You then weed the waste and transfer the design onto a bike, car, board or glass.
Why radium is harder to cut than vinyl
- Thicker face: the blade has to travel deeper than it does on standard sign vinyl.
- Tough surface: beads and prisms resist the knife and dull it faster.
- Long pieces: names and stripes run for a long distance, so any sideways drift ruins the job.
- Weeding: a cut that is almost deep enough still tears the letter when you peel the waste.
How to cut radium
Choose the film grade
Engineering-grade radium is the usual bike and car film. Thicker high-intensity film needs more force and often a 60-degree blade.
Prepare a bold vector
Use closed paths, convert text to curves, and avoid hairline strokes that will tear when you weed.
Fit a sharp blade
Use 45 degrees for thinner radium and 60 degrees for thick film. Set the depth to cut the face, not the liner.
Load the roll straight
Long names and stripes drift if the film is crooked. Set pinch rollers on the edges.
Test cut
Cut a small letter, weed it, then adjust force or speed before the full job.
Cut, weed and apply
Weed soon after cutting, use a suitable transfer tape, and apply to a clean, dry surface.
Blade and force for radium cutting
| Film | Blade | Force | Speed |
|---|---|---|---|
| Thin engineering-grade radium | 45° | Higher than sign vinyl | Medium |
| Thick / high-intensity film | 60° | High, or two lighter passes | Slow |
| Small text on radium | Sharp 45° or 60° | Just enough to weed | Slow |
Exact numbers change with the brand and the plotter. A good test cut weeds in one pull and leaves only a faint line on the liner. General vinyl settings are in cutting vinyl.
Radium not weeding cleanly?
Tell us the film you cut and how many jobs you do a day. We will suggest a Skycut plotter and share the price.
Weeding and application
- Weed soon after cutting. Reflective adhesive can grab harder if the sheet sits.
- Peel at a low angle so small counters in letters stay down.
- Use a transfer tape that can lift thick film, not the lightest tape you use on thin vinyl.
- Clean the panel before application. Oil and dust lift edges on bikes and cars.
- Squeegee firmly and avoid applying in rain or heavy dust.
Reflective marks on commercial vehicles may need certified film and must follow current transport rules. Check the requirement for the vehicle before you promise the job.
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Common radium cutting problems
| Problem | What to change |
|---|---|
| Letters do not lift | More force, a slightly longer blade, or a second pass |
| Liner is cut through | Reduce blade depth before you drop the force |
| Corners tear | New blade, slower speed, check blade offset |
| Long names drift | Reload straight and check pinch-roller pressure |
| Film shifts under the knife | Lower the force and use two passes instead of one heavy cut |
Machines for radium cutting
| Radium work | Plotter |
|---|---|
| Bike and car stickers, daily names | Skycut V24 |
| Radium cutting from morning to night | Skycut VH-24 / VH-48 |
| Thick high-intensity film and wide stripes | Skycut D24 / D48 |
Frequently asked questions
Final thoughts
Clean radium cutting is a test cut, a sharp blade and enough force to weed without slicing the liner. Start on the Skycut V24 for regular bike and car work, use the VH Series when the plotter runs all day, and the D Series when the film is thick. The buying comparison is in our radium plotter guide.
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