Coating Spray for sublimation is a liquid polyester-based solution designed to be applied to non-polyester or “uncoated” substrates (such as wood, ceramic, or cotton). Once sprayed and cured, it creates a synthetic surface layer that allows sublimation ink to bond with the product during the heat-transfer process.
Why It Matters: Impact and Use
While the concept of turning “any object” into a sublimatable substrate is a popular topic for DIY enthusiasts, professional decorators approach coating sprays with caution.
- Professional Recommendation: For a commercial-grade result, it is almost always more cost-effective and reliable to purchase “Sublimation Ready” blanks. These items come with a machine-applied, high-gloss polyester coating that ensures consistent color reproduction and professional durability.
- Sublimation Compatibility: Sublimation ink is chemically engineered to bond only with polyester molecules. On a non-polyester item (like a standard ceramic mug), the ink has nothing to “grab,” and the image will simply wash off. A coating spray provides that necessary chemical bridge.
- The Challenge of Consistency: Achieving a perfectly flat, “factory-finish” layer with a handheld spray is notoriously difficult. Common issues include orange peel texture, uneven thickness, and dust contamination, all of which lead to “sub-optimal” prints with splotchy colors.
- Durability Concerns: Unlike factory-applied coatings that are baked on in industrial environments, DIY coating sprays often lack long-term UV resistance and dishwasher safety. This can lead to the image fading or the coating peeling away over time.
Technical Comparison: DIY Spray vs. Factory Coated
| Feature | DIY Coating Spray | Factory-Applied Coating |
| Surface Finish | Variable (often textured or uneven). | High-gloss, perfectly smooth. |
| Durability | Low (prone to scratching/fading). | High (Dishwasher and UV safe). |
| Production Speed | Slow (requires spraying and drying). | Instant (Ready to press). |
| Best For | Prototyping or unique hobby crafts. | Retail-ready products and business orders. |
Frequently Asked Questions
Can I sublimate on anything using a coating spray?
Technically, yes. A coating spray adds a polyester layer to non-polyester surfaces. However, it is very difficult to achieve a smooth, professional finish, and the results are often not as durable as pre-coated sublimation blanks.
hy is my sublimation coating spray peeling?
Peeling usually occurs due to improper surface preparation or insufficient curing. If the substrate isn’t perfectly clean or if the spray is applied too thick, the bond will be weak and fail under heat or during washing.
Is coating spray better than buying sublimation blanks?
No. For professional use, buying pre-coated sublimation blanks is recommended. They offer a more consistent surface, better color vibrancy, and significantly higher durability than manual coating sprays.
