Painting Surface
TPU
Thermoplastic polyurethane (TPU) is a flexible plastic used in cases, films, footwear, and seals; stretching can challenge coating adhesion and durability.
Paint compatibility with TPU
A coating must be approved for the specific TPU grade and its flexing; rigid films or incompatible solvents may crack, swell, or lose adhesion during use.
| 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, Covestro TPU chemical resistance, and Sculpteo TPU part painting and flexible coating options.
Painters who used TPU
PaintZeal has no documented painter examples for TPU, a flexible industrial plastic; the table below focuses on coating choices and adhesion limits.
TPU paint articles
PaintZeal has no TPU articles yet; this guide covers flexible coatings, preparation, compatibility limits, and related advice for plastic and rubber.