The chemistry of coatings from liquid to solid: comparison of 5 mainstream curing mechanisms.
Nucleophilic addition, no volatile byproducts, shrinkage ~2%. Products: EP-ZR, EP-MIO, SEAL.
NCO + OH / NCO + moisture, moderate exotherm, flexible. Products: PU-TC, TOP, SOFT-2K.
Same as PU but main chain contains C-F, weathering performance soars. Products: FEVE-FC.
Second-level cure, requires UV light, watch out for oxygen inhibition. Products: UV-PR, GEL-UV.
Dehydration dealcoholization condensation, requires baking or oxidative drying. Products: HT-400/600.
| Mechanism | Surface DryTime | Full Cure | Temperature Dependent |
|---|---|---|---|
| UV | 1-3 s | Second-level | No |
| PU 2K | 0.5-1 h | 7 d | medium |
| Epoxy Amine | 4-6 h | 7 d | High(Does not cure below 5°C) |
| Silicone | 24 h | Bake 200°C/30min | High |
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