Technology
IR ceramic curing — heat from the inside out
8 minEstimated reading time — roughly how many minutes it takes to read at a normal screen pace.
An IR lamp is not a “faster hair dryer”. It can turn 24 h ambient cure into 15 minutes without sacrificing adhesion or life. Infrared passes through a thin ceramic film and heats from the substrate outward — opposite of
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IR ceramic curing — heat from the inside out
An IR lamp is not a “faster hair dryer”. It can turn 24 h ambient cure into 15 minutes without sacrificing adhesion or life. Infrared passes through a thin ceramic film and heats from the substrate outward — opposite of a heat gun.
Interactive cure physics
Interactive cure physics
IR cure for wheel ceramic
Posuvníky vzdálenosti lampy a času. Cíl: ~60 °C povrchové teploty filmu při 15 min. Příliš blízko vyvolá solvent pop, příliš daleko pod-cure.
Under-cure — low heat
Pod-cureFilm has not reached the effective temperature for controlled solvent evaporation. Extend time or reduce distance. Target 60 °C / 15 min.
Teplota filmu: 45 °C
Adjust lamp distance and time. Watch film temperature and when solvent-pop bubbles appear.
Three cure paths
1. Ambient cure
Free cure at 10–30 °C. ~24 h touch dry, 7 days full cure. Siloxane condensation with airborne moisture.
- Pro: no equipment, no overheat risk.
- Con: long downtime, no water/chemistry.
2. Heat gun (surface heating)
Convective/radiant heat from outside — mainly surface hardens first.
- Pro: cheap, fast surface dry.
- Con: surface seals before depth → solvents trapped → solvent pop haze.
Heat gun for local drying (wet spot after wash), not full ceramic cure.
3. IR lamp (volume heating)
IR at suitable wavelength passes thin ceramic film and heats substrate. Substrate re-radiates into the film.
Result:
- Deep solvents get heat before the surface.
- Evaporation paths open upward.
- Surface hardens last.
- No trapped solvent, no pop.
Why “inside out” matters
Model: 2 µm film in three layers (0–0.7, 0.7–1.4, 1.4–2 µm).
Heat gun:
- Top: 70 °C, rapid cure.
- Middle: 50 °C, partial cure.
- Bottom: 30 °C, solvents remain.
- Bottom solvents expand, cannot escape → bubbles.
IR lamp:
- Bottom: 65 °C, solvents evaporate.
- Middle: 60 °C, bottom solvents pass through.
- Top: 55 °C, still compliant, solvents exit.
- After minutes all solvents gone; full matrix cure together.
Sweet spot — 60 °C / 15 min / 75–90 cm
| Parameter | Value | Why |
|---|---|---|
| Distance | 75–90 cm | Safe window for typical IR lamp |
| Film temp | 55–65 °C | Optimal solvent release, no overheat |
| Time | 15 min | Full evaporation and matrix cure |
| Ambient | 10–30 °C | Outside = marginal |
When IR is out of spec
Too close (< 60 cm)
- Film > 70 °C fast.
- Top hardens first.
- Deep solvents trapped → solvent pop.
Too far (> 120 cm)
- Film stays under 50 °C.
- Under-cured after 15 min → damage risk in first 24 h.
Too long (> 30 min)
- Low risk at correct distance.
- Short distance → substrate overheat (paint / anodizing).
Too short (< 10 min)
- Incomplete solvent release.
- Mild under-cure; finishes ambiently over 24 h with slightly lower life.
Safety
When not to use IR
- Poorly ventilated garage (overheat + solvent buildup).
- Magnesium wheels (local overheat risk).
- Wheels with undeclared heat-rated paint (some old powder coats).
- Client in vehicle (no in-situ cure while occupied).
Ambient cure is fully valid — just slower (24 h vs 15 min).
Takeaways
- IR heats inside out; heat gun heats outside in.
- Sweet spot: 60 °C / 15 min / 75–90 cm.
- Solvent pop from short distance and high temperature.
- Ambient cure works; IR only speeds it.
Further reading
Topic: Prep & washing
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