To make printed ink resistant or impervious to water, the common approach is to protect the printed surface rather than altering the ink's composition itself.
While the inherent water resistance of ink depends on its type (pigment inks are generally more water-resistant than dye inks), applying a protective layer over the dried ink is a practical way to achieve a waterproof or highly water-resistant result for the print.
Applying Protective Coatings and Laminates
Several techniques are used to create a barrier over printed ink, shielding it from moisture. These methods create a physical layer that water cannot easily penetrate.
Here are some common methods:
| Method | Description | Benefits | Common Use Cases |
|---|---|---|---|
| UV Spray Coat | Applying a liquid coating, often aerosolized, that forms a clear protective film upon drying. | Creates a water-resistant and often UV-resistant barrier; preserves color. | Art prints, photographs, documents on paper or canvas where flexibility is needed. |
| Apply Vinyl Laminate Adhesive | Adhering a layer of waterproof vinyl film, typically with a pressure-sensitive adhesive backing, over the print. | Forms a durable, waterproof, scratch-resistant, and often UV-resistant layer. | Stickers, labels, signage, decals, protective coverings for frequently handled items. |
| Apply Laminate Using Heat Laminator | Encasing the print between two layers of plastic film and bonding them together using heat and pressure. | Provides complete encapsulation, resulting in rigid, highly durable, and fully waterproof protection. | Documents, IDs, cards, menus, or prints requiring maximum protection and stiffness. |
These methods work by creating a physical shield that prevents water from reaching and damaging the ink layer beneath.
Key Considerations for Waterproofing Prints
When choosing a method to protect printed ink from water, consider these factors:
- Type of Ink: While protection methods work for most inks, some inks are more susceptible to smudging during the application process (especially liquid coatings) if not fully cured.
- Printing Surface: The material the ink is printed on (paper, vinyl, canvas, etc.) dictates which methods are feasible and effective.
- Required Durability: How much wear and tear will the print experience? Lamination offers the highest level of physical protection.
- Flexibility: Does the final product need to be flexible (like a sticker or print on canvas) or rigid (like a laminated ID)?
- Appearance: Coatings and laminates can affect the finish (matte or gloss) and color appearance slightly.
By applying a protective coating or laminate over the printed area, you can effectively waterproof the ink and the underlying print.
