Yes, you can sublimate over screen print, but it’s not a straightforward process and often yields less-than-ideal results. Sublimation ink requires a polyester surface to bond with, and screen print ink is typically applied to cotton or cotton blends, which are not suitable for direct sublimation.
Sublimating Over Screen Prints: What You Need to Know
Many crafters and small business owners wonder if they can sublimate directly over an existing screen print. The short answer is: it’s complicated, and usually not recommended for professional results. Understanding the fundamental differences between sublimation and screen printing is key to grasping why this is the case.
The Science Behind Sublimation and Screen Printing
Sublimation printing is a unique process that uses heat to transfer dye onto materials. The dye turns into a gas under heat and pressure, and then bonds with the polyester fibers of the fabric. This creates a vibrant, permanent image that won’t peel or crack.
Screen printing, on the other hand, involves pushing ink through a stenciled screen onto the fabric. This ink sits on top of the fabric’s surface. It’s a versatile method, but the ink’s composition and application differ significantly from sublimation.
Why Direct Sublimation Over Screen Print is Problematic
The primary challenge lies in the fabric compatibility. Sublimation works best on 100% polyester fabrics. Screen printing inks, especially those used for cotton or cotton-blend garments, do not contain the polyester fibers that sublimation ink needs to adhere to.
When you attempt to sublimate over a screen print, you’re essentially trying to apply a gas-based dye to a surface that’s already covered in a different type of ink and likely made of a different material. This leads to several potential issues:
- Poor Ink Adhesion: The sublimation ink may not bond properly to the screen-printed area.
- Color Bleeding or Muting: The underlying screen print ink can bleed through or mute the colors of your sublimation design.
- Uneven Transfer: Heat and pressure may not be applied evenly, resulting in a patchy or faded sublimation image.
- Cracking or Peeling: The sublimation layer might not adhere well to the screen print, leading to premature wear.
Can You Sublimate Over a Screen Print with a Polyester Overlay?
While direct sublimation is problematic, there are workarounds if you’re determined to combine these techniques. One common method involves using a polyester sublimation transfer paper or a polyester fabric patch as an intermediary layer.
Here’s a simplified overview of how this might work:
- Prepare the Garment: Ensure the area where you want to sublimate is clear of any loose screen print ink.
- Apply Polyester Layer: Sublimate your design onto a separate piece of 100% polyester fabric or a polyester sublimation transfer paper.
- Attach the Polyester Layer: Use a heat press to adhere this sublimated polyester piece onto the garment, effectively covering the screen print.
This method ensures that your sublimation ink has a proper polyester surface to bond with. However, it adds bulk and a seam to your final product.
Alternatives to Sublimating Directly Over Screen Prints
If your goal is to achieve a multi-technique decorated garment, consider these more reliable alternatives:
- Sublimation and Vinyl: Sublimate a design onto sublimation vinyl, then heat press the vinyl onto the garment. This works well on various fabric types.
- Screen Printing and Embroidery: Combine the bold colors of screen printing with the texture and dimension of embroidery for a professional look.
- DTG Printing and Screen Printing: For complex, full-color designs, Direct-to-Garment (DTG) printing can be combined with screen printing for specific graphic elements.
What About Sublimating Over White Ink Screen Prints?
Some crafters ask about sublimating over white ink screen prints, hoping the white ink acts as a base. While white ink can sometimes provide a slightly better surface than colored inks, it still doesn’t offer the 100% polyester requirement for true sublimation.
The white ink is still an ink layer on top of the fabric. You might experience some color transfer, but it’s unlikely to be as vibrant or durable as a direct sublimation on polyester. The underlying fabric’s composition remains the primary limiting factor.
Practical Considerations and Best Practices
When working with mixed media decoration, always test your process on scrap fabric first. This helps you identify potential issues before committing to a customer’s order.
- Heat Press Settings: Ensure your heat press is calibrated correctly for both the sublimation and any adhesive layers you might use.
- Fabric Type: Always confirm the fabric composition of your garment. Sublimation is strictly for polyester.
- Design Placement: Consider how the screen print will interact visually with your sublimation design.
When Might It Seem to Work (and Why It’s Still Risky)
Occasionally, you might see examples online where someone appears to have sublimated over a screen print with seemingly acceptable results. This is often due to:
- Low-Quality Screen Prints: The original screen print might have been thin or had poor adhesion, allowing some sublimation ink to penetrate.
- Polyester Blends: The garment might have been a higher polyester blend than initially assumed, allowing for some limited sublimation.
- Expectations: The creator’s expectations for durability and vibrancy might be lower.
However, these instances are generally not reliable for commercial production or for customers expecting long-lasting, high-quality results.
Frequently Asked Questions (PAA)
### Can you sublimate on a t-shirt that has a screen print on it?
Generally, you cannot effectively sublimate directly onto a t-shirt that has a screen print on it, especially if the shirt is made of cotton or a cotton blend. Sublimation requires a polyester surface to bond with, and screen print ink sits on top of the fabric, not within its fibers.
### Will sublimation ink stick to screen print ink?
Sublimation ink is designed to bond with polyester fibers, not with other types of ink like screen print ink. While some minimal transfer might occur, it’s unlikely to be durable or vibrant, and the colors may bleed or appear muted.
### How do you cover a screen print with sublimation?
To cover a screen print with sublimation, you typically need to apply a polyester layer over the screen print. This can be done by sublimating your design onto a separate piece of polyester fabric or sublimation transfer paper and then heat pressing that onto the garment, effectively covering the screen print.
### Can you sublimate over plastisol ink?
Sublimating directly over plastisol ink is not recommended. Plastisol ink is a type of screen printing ink that sits on the surface of the fabric and is not polyester-based. Attempting to sublimate over it will likely result in poor adhesion, color distortion, and
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