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To sublimate a coaster, print a mirrored design on sublimation paper, tape it to the coaster's coated side, and press with butcher paper above and below. MDF and hardboard coasters take about 1 minute at 385–400°F, neoprene coasters a little under a minute, and ceramic coasters several minutes, around 4 minutes at 400°F in a flat press. Remove any protective film first, and follow your coaster maker's settings when they publish them.
Coaster types and settings
| Coaster | Temperature | Time | Pressure | Source |
|---|---|---|---|---|
| Unisub hardboard coaster, 1/8 in (raw or cork back) | 385°F (195°C) | 1:00–1:10 | 60 PSI in Unisub's tests | Unisub chart |
| Hardboard (generic) | 360–400°F | 40–80 sec | Medium | JP Plus generic chart |
| MDF cork-back coaster (24-pack listing) | 355–375°F (180–190°C) | 60–70 sec | Per listing | Amazon listing |
| Woods (general) | 400°F (204°C) | 1 min 15 sec | Per press | Geo Knight press manuals |
| Ceramics, flat | 400°F (204°C) | 4 min | Per press | Geo Knight press manuals |
| Polyester-coated neoprene | 380–400°F | 45–55 sec | Light to medium | JP Plus generic chart |
Coasters from different makers vary, which is why the ranges above overlap. JP Plus notes that hardboard is forgiving but that larger items need longer times. More blanks are in our sublimation temperature chart.
MDF and hardboard coasters
The most common sublimation coaster: a coated hardboard or MDF square or round, often with a cork back. They press fast, give bright color and are cheap in bulk. KUKLIPJIM, for example, sells 35-packs of 3.75 x 3.75-inch square MDF coasters with non-slip cork backing.
Ceramic coasters
Glossy ceramic tiles give a premium, glass-like finish; absorbent ceramic or sandstone-style coasters soak up drink condensation and have a matte look. Both take longer to heat through than MDF. Packs of 4-inch round absorbent ceramic coasters with cork backing are common.
Neoprene and fabric-top coasters
Soft rubber coasters with a polyester fabric top, including most car coasters. JP Plus notes that polyester-coated neoprene typically gives off a smell when pressed, which is normal. Use light to medium pressure so the foam doesn't compress unevenly.
How to sublimate MDF coasters, step by step
- Peel the protective film off the printable side, if there is one.
- Size the design slightly larger than the coaster (about 1/8 inch of bleed) so no white edge shows. For rounds, add a little bleed all around.
- Mirror and print on sublimation paper. Several coaster designs fit on one letter sheet.
- Cut out each print with a margin, and lint-roll the coaster.
- Tape the print face-down to the coated side with heat-resistant tape on two or more edges.
- Set up the press at your coaster maker's setting, or start at 385°F for about 1 minute at medium pressure.
- Sandwich it: butcher paper on the lower platen, the coaster, then butcher paper on top.
- Press, then open and remove the coaster with gloves.
- Peel promptly in one motion while hot.
- Cool flat, coated side up, before stacking.
How to sublimate ceramic coasters
- Clean the tile with a lint-free cloth.
- Tape the print face-down on the glossy or coated side.
- Press face up at your tile maker's setting, or start at 400°F for about 4 minutes, per Geo Knight's manuals for flat ceramics.
- Use medium pressure. Too much pressure can crack thin tiles; a pressing pad underneath helps uneven backs.
- Lift with gloves. Ceramic stays hot much longer than MDF.
- Cool on a heat-safe surface away from drafts, then peel any paper left on.
- Attach cork backs after cooling if your tiles don't come with them.
Pressing several coasters at once
A 15 x 15 press fits a batch of coasters in one cycle. Space them evenly across the platen so pressure stays level, use coasters of the same thickness in each batch, and don't mix ceramic with MDF, since their times differ. Unisub's chart was built on a large swing-away press; if your press is lighter, you may need a little more time. Our sublimation blanks guide covers other hard goods you can batch the same way, including hardboard sublimation puzzles.
What you'll need
- Coaster blanks made for sublimation
- Sublimation printer, ink and paper
- Heat-resistant tape and gloves
- Fresh butcher paper for every press
- A flat heat press (12 x 12 or larger for batches)
Our sublimation supplies checklist has specific picks.
How to sublimate neoprene and car coasters
- Lint-roll the fabric top, since fibers leave white specks on soft surfaces.
- Pre-press for a few seconds to remove moisture.
- Tape the mirrored print face-down on the fabric side.
- Press at light to medium pressure, starting around 380–400°F for 45–55 seconds per JP Plus's generic chart, or your coaster's own settings.
- Peel straight up while hot and let the coaster cool flat.
Expect a rubbery smell during pressing; JP Plus notes it's normal for polyester-coated neoprene. Small 2.75-inch car coasters fit many to a platen, so space them evenly.
Choosing coasters to sell
| Coaster type | Look and feel | Best for |
|---|---|---|
| MDF/hardboard with cork back | Glossy or semi-gloss, light | Photo sets, bulk gifts, events |
| Glossy ceramic tile | Glass-like, heavy | Premium gift sets |
| Absorbent ceramic or sandstone | Matte, soaks up condensation | Everyday drink coasters |
| Neoprene or fabric-top | Soft, flexible | Car coasters, bar mats |
Sets of four in a box or gift bag are a classic format. Use coasters from the same pack for a set, so the coating and color match.
Sizing coaster designs
Measure the coaster rather than trusting the listing name: a "4-inch" coaster may print slightly smaller once you allow for a rounded edge. Make a template at the exact size plus bleed, save it, and drop each new design into it. For round coasters, a circle template with a thin bleed ring avoids white edges.
Troubleshooting coasters
| Problem | Likely cause | Fix |
|---|---|---|
| Faded print | Too short, too cool, or film left on | Remove film; add time first |
| White edges | No bleed, or paper shifted | Size slightly larger; tape firmly |
| Blurry or doubled edges | Paper moved when the press opened | Tape on two sides; peel in one motion |
| Brown or scorched surface | Too hot or too long | Lower temperature or time |
| Uneven color across a batch | Mixed thicknesses or light pressure | Press same-thickness coasters together |
| Cracked ceramic | Too much pressure or sudden cooling | Medium pressure; cool slowly |
Common mistakes
- Pressing raw wood or uncoated cork. It needs a sublimation coating; see our sublimation on wood guide.
- Forgetting the film. The print won't transfer through it.
- Using one setting for every coaster. Ceramic needs minutes; MDF about a minute.
- Reusing butcher paper. Stray dye ghosts onto the next coaster.
- Stacking warm coasters. Let them cool flat first.
FAQ
What temperature and time do you sublimate coasters at?
It depends on the coaster. Unisub presses its 1/8-inch hardboard coasters at 385°F (195°C) for 1:00–1:10. Geo Knight's press manuals list flat ceramics at 400°F for 4 minutes. JP Plus's generic chart puts polyester-coated neoprene at 380–400°F for 45–55 seconds. Follow your coaster maker's settings first.
How long do you sublimate ceramic coasters?
Longer than MDF. Ceramic holds and spreads heat slowly, so Geo Knight's manuals start flat ceramics at 400°F for 4 minutes. Absorbent sandstone-style coasters vary, so use the time on your coaster's listing or insert and test one first.
Do sublimation coasters go face up or face down?
Either can work, but for MDF and hardboard most people place the coaster face down on the print, or face up with the print taped on top, covered with butcher paper. Follow the blank maker's directions, and keep fresh butcher paper above and below.
Do you need to remove the film on sublimation coasters?
Yes. Many hardboard and MDF coasters ship with a protective film on the printable side. Geo Knight and HTVRONT both say to remove protective film before heating; if you press over it, the print won't transfer properly.
Can you sublimate car coasters?
Yes. Car coasters are usually 2.75-inch neoprene, fabric-topped or ceramic rounds made for sublimation. Use the coaster's own settings; neoprene presses in under a minute, ceramic takes longer.