Air-Dry vs Baked Coil Coatings
Air-dry vs baked
| Air-dry | Baked | |
|---|---|---|
| Cure | Ambient. PG-C is touch-dry in 4 h and fully cured after 72 h. | Oven at part temperature, e.g. PG-S2 at 160 °C / 60 min or 180 °C / 30 min. |
| Film control | Depends on spray technique; films are usually thicker (PG-C 20–40 μm). | Dip or flood with controlled drain-off; thin, even films (PG-S2 5–10 μm). |
| Suitable parts | Complete outdoor units, assembled equipment, site repairs. | Loose coils, radiators and parts that fit the oven. |
| Throughput | Parts wait on the floor until cured before handling and packing. | Parts can be packed once cooled after the oven. |
| Typical systems | PG-C; PG-S1 with ambient moisture cure. | PG-S2; PG-S1 with thermal cure. |
Choose air-dry if…
- The unit cannot be dismantled or put in an oven
- Coating or touch-up happens on site
- Chemical or wastewater exposure calls for a thicker film
Choose baked if…
- The coil can be removed or coated before assembly
- Film thickness must be tightly controlled on high-density fins
- Line throughput matters more than floor space
Cost and lead time
Neither route is cheaper in every case. Baking needs an oven large enough for the part and the energy to run it, but parts move to packing the same day. Air-dry needs no oven, but parts occupy floor space for several days while the film cures, which adds to the schedule on large orders.
For complete units the choice is usually made by the equipment itself: if the controls, sensors and compressor cannot be removed safely, the unit is coated with an air-dry system after masking.
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