Painting Surface
TPU
Thermoplastic polyurethane is a flexible plastic used in cases, films, footwear, seals, and protective parts, with elasticity affecting coating performance.
Paint compatibility with TPU
Flexible coatings can work when they are approved for the exact TPU grade, while rigid films and aggressive solvents can cause cracking, swelling, or poor adhesion.
| Paint | Compatibility | Preparation | Primer or ground | Finish | Guide |
|---|---|---|---|---|---|
| Flexible specialty coating | Best when explicitly approved for the TPU grade and expected flexing | Clean and dry the surface and remove mold-release or processing residue without using an incompatible solvent. | Use only the adhesion promoter or primer specified by the coating manufacturer. | The coating must remain flexible enough for the part's normal deformation. | — |
| Paint markers | Formula-specific | Clean the surface and test adhesion and flexibility before committing to the design. | Usually product-specific. | Best on lower-flex areas where handling and abrasion are limited. | — |
| Spray paint | Use only when the exact aerosol system approves the TPU | Avoid assuming that a general plastic spray is compatible; some solvents can swell or damage TPU. | Product-specific. | Rigid aerosol films can fail as flexible TPU bends or stretches. | — |
| Acrylic paint | Limited and formula-specific | Test first on the actual TPU because hardness, chemistry, and additives vary between grades. | A compatible flexible primer or additive may be required. | Ordinary acrylic films may crack or peel on highly flexible TPU. | — |
Sources: Covestro TPU structure and properties and Covestro TPU chemical resistance.
Painters who used TPU
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TPU paint articles
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